OC&&IOS开发小技巧总结
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2022-05-01 17:35:43
1.数组遍历的三种方式
2. 使用 [obj class]属性获得类名成,利用类名称创建对象
3.给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数...
1.数组遍历的三种方式
2. 使用 [obj class]属性获得类名成,利用类名称创建对象
3.给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数
4.利用[UIImage animatedImageNamed:@“” duration:]可以达到蝴蝶翩翩飞过,的效果,不过要开一个定时器,才能让图片横向的移动
5. 给Button设置背景图片,并且button的大小跟图片的大小一样大
6.用addViewController做类似于导航控制器的作用
7.打电话
8.给导航栏添加图片
9.生成二维码图片(包含链接),并且添加视图上
10.给一个View设置层的边框颜色,边框宽度,变的圆角,
11.给一个Lable添加NSAttributeString,包含设置字体,字的间距,字体的颜色,字体的大小
12获得改字符串的大小
13.一个视图控制器退出的时候,要隐藏系统的底部的导航栏
14.创建前后颜色不同的字符串
15.给UITableView去掉分割线
16.给某个View的下方添加波浪线
17.获得IP地址及Mac地址
18.创建一个UIImageView,并且设置渐变色
19.设置UITableView的某个cell不可选
21.隐藏和现实导航栏,只管本视图控制器的navagationController的显示和隐藏,不影响其他的视图控制器
22.原生的给设置tabBarItem设置图片,字体,以及设置,文字和图片之间距离
23.给字符串添加下划线
24.给导航栏的标题设置文字的颜色,字体的大小
25,断网的判断及处理,要包含Reachability.h的头文件
25,断网的判断及处理,要包含Reachability.h的头文件
26.动态将UITableViewCell滚动到指定的cell
27.一段文字设置行间距
28.签到动画
29.给城市排序按照拼音
30.发邮件,打电话，发短信，打开网址
32.判断手机网络运营商
33 NSData同步请求网络数据
34view和window之间坐标转换
35.ViewController的生命周期
36程序启动原理
37.UITableViewCell 文字位置调整
38.ios带圆角图片的拉伸
39自定义UINavigtion
1.数组遍历的三种方式(for ,for in ,枚举器)
int main(int argc, const char * argv[])
{
@autoreleasepool {
//创建一个Car类,两个属性:名字,颜色
//创建3个对象,加到数组里
//输出数组
Car *car1 = [[Car alloc] initWithName:@"宝马汽车" andColor:'R'];
Car *car2 = [[Car alloc] initWithName:@"奔驰汽车" andColor:'B'];
Car *car3 = [[Car alloc] initWithName:@"奥迪汽车" andColor:'W'];
NSArray *array = [NSArray arrayWithObjects:car1,car2,car3, nil];
//循环遍历数组
[[array objectAtIndex:0] setName:@"拖拉机"];
// for(int i = 0; i < [array count]; i++)
// {
// NSLog(@"%@",[array objectAtIndex:i]);
// }
//for in
//快速遍历数组
//从前往后 完整遍历
//数组中有多种对象的时候用id
//可变数组的时候,并且要改变数组长度的时候不要用
for(Car *obj in array)
{
NSLog(@"%@",obj);
}
//枚举器用来遍历数组
//- (NSEnumerator *)objectEnumerator;
//1 2 3 4 5 6
//把数组的所有元素依次存放到枚举器
NSEnumerator *enumerator = [array objectEnumerator];
enumerator = [array reverseObjectEnumerator];
id obj = nil;
while(obj = [enumerator nextObject]){
NSLog(@"%@",obj);
}
while(obj = [enumerator nextObject])
{
NSLog(@"%@",obj);
}
枚举器block
[moduleArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
}];
}
return 0;
}
2. 使用 [obj class]属性获得类名成,利用类名称创建对象
#import
#import "mybuton.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
mybuton*btn=[mybuton creatBtn:SJX];
[btn showType];
}
return 0;
}
#import
typedef enum
{
SJX,
YX
}BtnType;
@interface mybuton : NSObject
-(void)showType;
+(instancetype)creatBtn:(BtnType)type;
@end
#import "mybuton.h"
#import"mybuton_SJX.h"
#import "mybuton_YX.h"
@implementation mybuton
-(void)showType
{
NSLog(@"我是一个按钮");
}
+(instancetype)creatBtn:(BtnType)type
{
Class myclass[]={[mybuton_SJX class],[mybuton_YX class]};
mybuton*btn=[[myclass[type]alloc]init];
return btn;
}
@end
#import "mybuton.h"
@interface mybuton_SJX : mybuton
@end
#import "mybuton_SJX.h"
@implementation mybuton_SJX
-(void)showType{
NSLog(@"我是一个三角形按钮");
}
@end
3.给一个UIImageView 添加一个动画数组,可以设置动画时间,循环次数
images = [NSArray arrayWithObjects:
[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"],
[UIImage imageNamed:@"3.jpg"],
[UIImage imageNamed:@"4.jpg"],
[UIImage imageNamed:@"5.jpg"], nil];
// 设置iv控件需要动画显示的图片为images集合元素
self.iv.animationImages = images;
// 设置动画持续时间
self.iv.animationDuration = 12;
// 设置动画重复次数
self.iv.animationRepeatCount = 999999;
// 让iv控件开始播放动画
[self.iv startAnimating];
可以每隔2.4s动画,更新图片,循环99999次
4.利用[UIImage animatedImageNamed:@“” duration:]可以达到蝴蝶翩翩飞过,的效果,不过要开一个定时器,才能让图片横向的移动
// 定义显示图片的UIImageView控件
UIImageView* iv;
// 定义定时器
NSTimer* timer;
- (void)viewDidLoad
{
[super viewDidLoad];
// 设置背景色为白色
self.view.backgroundColor = [UIColor whiteColor];
// 创建UIImageView控件
iv = [[UIImageView alloc]
initWithFrame:CGRectMake(0 , 30 , 41 , 43)];
// 使用UIImageView加载文件名以butterfly_f开头的多张图片
iv.image = [UIImage animatedImageNamed:@"butterfly_f"
duration:0.6];
// 将UIImageView添加到系统界面上
[self.view addSubview: iv];
// 启动NSTimer定时器来改变UIImageView的位置
timer = [NSTimer scheduledTimerWithTimeInterval:0.1
target:self selector:@selector(changePos)
userInfo:nil repeats:YES];
}
- (void) changePos
{
CGPoint curPos = iv.center;
// 计算一个-4~5之间随机数
int y = arc4random() % 10 - 4;
// 当curPos的x坐标已经超过了屏幕的宽度
if(curPos.x > [UIScreen mainScreen].bounds.size.width)
{
// 控制蝴蝶再次从屏幕左侧开始移动
iv.center = CGPointMake(0, 30);
}
else
{
// 通过修改iv的center属性来改变iv控件的位置
iv.center = CGPointMake(curPos.x + 4, curPos.y + y);
}
}
5. 给Button设置背景图片,并且button的大小跟图片的大小一样大
UIImage* backImg = [UIImage imageNamed:@"back_white"];
UIButton* btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, backImg.size.width, backImg.size.height)];
[btn addTarget:self action:@selector(backClick) forControlEvents:UIControlEventTouchUpInside];
[btn setImage:backImg forState:UIControlStateNormal];
//[btn setImage:backImg forState:UIControlStateHighlighted];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
6.用addViewController做类似于导航控制器的作用
ResultViewController *result = [[ResultViewController alloc] initWithNibName:@"ResultViewController" bundle:nil];
[self.parentViewController addChildViewController:result];
[self.parentViewController.view addSubview:result.view];
result.view.frame = CGRectMake(WIDTH, 0, WIDTH, HEIGHT);
[UIView
animateWithDuration:0.3
delay:0.0
options:UIViewAnimationOptionCurveEaseInOut
animations:^{
CATransition *animation = [CATransition animation];
[animation setDuration:0.3];
[animation setType:kCATransitionPush];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[animation setSubtype:kCATransitionFromRight];
[self.navigationController.view.layer addAnimation:animation forKey:nil];
result.view.frame = CGRectMake(0, 0, WIDTH, HEIGHT);
}
completion:^(BOOL finished) {
}];
7.打电话
如果是飞行模式,手机系统会弹出是否停用飞行模式
如果没有卡,也会提示
如果有卡,并且不是飞行模式,程序会自动进入后台,前台会弹出拨号的界面
#pragma mark - 打电话
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
NSLog(@"打电话");
if (buttonIndex==0) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"tel://%@",@"4008-230-950"]]];
}
}
8.给导航栏添加图片
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, ViewWidth*0.3, 22)];
imageView.image=[UIImage imageNamed:@"tapmoney"];
self.navigationItem.titleView=imageView;
9.生成二维码图片(包含链接),并且添加视图上
前提是要导入ZBar.h和QRCodeGenerator.h头文件
UIImageView *twoDimensionCode=[WNController createImageViewWithFrame:CGRectMake(ViewWidth*0.2, ViewHeight*0.02, ViewWidth*0.5, ViewHeight*0.20) ImageName:nil];
twoDimensionCode.image=[QRCodeGenerator qrImageForString:@"www.baidu.com" imageSize:400];
[view addSubview:twoDimensionCode];
10.给一个View设置层的边框颜色,边框宽度,变的圆角,
UIView *view=[[UIView alloc]initWithFrame:CGRectMake(ViewWidth*0.05, 10, ViewWidth*0.9, ViewHeight*0.4)];
view.layer.borderColor=[[UIColor blackColor]CGColor];
view.layer.borderWidth=0.5;
view.layer.cornerRadius=5;
view.layer.masksToBounds=YES;
[self.view addSubview:view];
11.给一个Lable添加NSAttributeString,包含设置字体,字的间距,字体的颜色,字体的大小
NSAttributedString *attriStrTodayEarn =[[NSAttributedString alloc] initWithString:@"Today's earn" attributes:@{NSForegroundColorAttributeName : [UIColor whiteColor],NSKernAttributeName : @(-1.3f),NSFontAttributeName:[UIFont fontWithName:@"Gill Sans" size:1.8*NormalFont]}];
[todayEarn setAttributedText:attriStrTodayEarn];
12获得改字符串的大小
CGSize size=[middleLabel.text boundingRectWithSize:CGSizeMake(ViewWidth*0.7,NormalFont*3) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:middleLabel.font} context:nil].size;
13.一个视图控制器退出的时候,要隐藏系统的底部的导航栏
vc.hidesBottomBarWhenPushed=YES;
14.创建前后颜色不同的字符串
- (NSMutableAttributedString *)createAttributeStringWithStr:(NSString *)foreString withStr:(NSString *)afterString
{
NSString * joinstr = foreString;
NSString * text = afterString;
NSString *jointext = [NSString stringWithFormat:@"%@%@",joinstr,text];
NSDictionary *textDic = @{NSForegroundColorAttributeName:[UIColor colorWithRed:0.13f green:0.65f blue:0.00f alpha:1.00f],NSFontAttributeName:[UIFont systemFontOfSize:NormalFont ]};
NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc]initWithString:jointext];
[attributeString addAttributes:textDic range:NSMakeRange(joinstr.length, text.length)];
return attributeString;
//本质是NSMutableAttributedString 给一定范围的字符做颜色属性的改变
}
15.给UITableView去掉分割线
_tableView.separatorStyle=UITableViewCellSeparatorStyleNone;
cell.selectionStyle=UITableViewCellSelectionStyleNone;
16.给某个View的下方添加波浪线
-(void)drawRect:(CGRect)rect{
CGRect frame=self.frame;
CGFloat height=frame.size.height;
// CGFloat width =frame.size.width;
UIColor *color = [UIColor whiteColor];
[color set]; //设置线条颜
UIBezierPath* aPath = [UIBezierPath bezierPath];
aPath.lineWidth = 0.5;
aPath.lineCapStyle = kCGLineCapRound; //线条拐角
aPath.lineJoinStyle = kCGLineCapRound; //终点处理
aPath.lineCapStyle = kCGLineCapRound; //线条拐角
aPath.lineJoinStyle = kCGLineCapRound; //终点处理
for (int i=0; i<50; ++i) {
[aPath moveToPoint:CGPointMake(0+frame.size.width/50*i, height)];
[aPath addQuadCurveToPoint:CGPointMake(frame.size.width/50*(i+1), height) controlPoint:CGPointMake(frame.size.width/100+frame.size.width/50*i, height-5)];
[aPath fill];
}
17.获得IP地址及Mac地址
前提要包含
#import
#import
#include
#include
#include
#include
+(NSString *)getMACAddress{
int mib[6];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_LINK;
mib[4] = NET_RT_IFLIST;
if ((mib[5] = if_nametoindex("en0")) == 0) {
printf("Error: if_nametoindex error/n");
return NULL;
}
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 1/n");
return NULL;
}
if ((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. error!/n");
return NULL;
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
return NULL;
}
ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
free(buf);
return [outstring uppercaseString];
}
+(NSString *)getIPAddress{
NSString *address = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0) {
//Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return address;
}
18.创建一个UIImageView,并且设置渐变色
+(UIImageView *)progressiveImageframe:(CGRect)frame beginColor:(CGFloat *)Bcomponent endColor:(CGFloat*)Ecomponent {
UIImageView *imageView=[[UIImageView alloc]initWithFrame:frame];
UIGraphicsBeginImageContext(imageView.frame.size);
[imageView.image drawInRect:CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); //设置线条终点形状
CGContextRef context =UIGraphicsGetCurrentContext();
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
// 创建起点颜色 (CGFloat[]){0, 0.61, 0.81, 1} (CGFloat[]){0.87, 0.61, 0, 1}
CGColorRef beginColor = CGColorCreate(colorSpaceRef,Bcomponent );
// 创建终点颜色
CGColorRef endColor = CGColorCreate(colorSpaceRef, Ecomponent);
// 创建颜色数组
CFArrayRef colorArray = CFArrayCreate(kCFAllocatorDefault, (const void*[]){beginColor, endColor}, 2, nil);
// 创建渐变对象
CGGradientRef gradientRef = CGGradientCreateWithColors(colorSpaceRef, colorArray, (CGFloat[]){
0.0f, // 对应起点颜色位置
1.0f // 对应终点颜色位置
});
// 释放颜色数组
CFRelease(colorArray);
// 释放起点和终点颜色
CGColorRelease(beginColor);
CGColorRelease(endColor);
// 释放色彩空间
CGColorSpaceRelease(colorSpaceRef);
CGContextDrawLinearGradient(context, gradientRef, CGPointMake(0, 0), CGPointMake(0, frame.size.height), 0);
CGGradientRelease(gradientRef);
imageView.image=UIGraphicsGetImageFromCurrentImageContext();
return imageView;
}
19.设置UITableView的某个cell不可选
为了彻底避免UITableViewCell选择，让UITableViewDelegate实现tableView:willSelectRowAtIndexPath:。如果你不希望选中行，从那个函数可以返回nil
- (NSIndexPath *)tableView:(UITableView *)tv willSelectRowAtIndexPath:(NSIndexPath *)path
{
//根据 NSIndexPath判定行是否可选。
if (rowIsSelectable)
{
returnpath;
}
returnnil;
}
20.自定义一个CustomView给一个UIImageView添加一个点击的block
#import
@interface CustomImageView : UIImageView
@property(nonatomic,copy)void(^touchImage)();
@end
#import "CustomImageView.h"
@implementation CustomImageView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.userInteractionEnabled=YES;
}
return self;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
if (self.touchImage) {
self.touchImage();
}
}
@end
21.隐藏和现实导航栏,只管本视图控制器的navagationController的显示和隐藏,不影响其他的视图控制器
-(void)viewWillAppear:(BOOL)animated{
[super viewDidAppear:YES];
self.navigationController.navigationBarHidden=YES;
}
-(void)viewWillDisappear:(BOOL)animated{
self.navigationController.navigationBarHidden=NO;
}
22.原生的给设置tabBarItem设置图片,字体,以及设置,文字和图片之间距离
nc.tabBarItem = [[UITabBarItem alloc]initWithTitle:titles[i] image:[[UIImage imageNamed:imageArr[i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] selectedImage:[[UIImage imageNamed:selectedImageArr[i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
[nc.tabBarItem setTitlePositionAdjustment:UIOffsetMake(0, -4)];
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor lightGrayColor], NSForegroundColorAttributeName,[UIFont systemFontOfSize:SmallFont*0.9] ,NSFontAttributeName,nil] forState:UIControlStateNormal];
[[UITabBarItem appearance] setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:[UIColor orangeColor],NSForegroundColorAttributeName, nil]forState:UIControlStateSelected];
23.给字符串添加下划线
UILabel * standardF = [self createSingleLabelWithFrame:CGRectMake(space*4, CGRectGetMaxY(standard.frame)+space, ViewWidth-space*4, space*3) withAttributedString:@"亚马逊礼品卡使用协议"];
[self.view addSubview:standardF];
UILabel * standardW = [self createSingleLabelWithFrame:CGRectMake(space*4, CGRectGetMaxY(standardF.frame), ViewWidth-space*4, space*3) withAttributedString: @"个人资料隐私及保护协议"];
[self.view addSubview:standardW];
}
- (UILabel *)createSingleLabelWithFrame:(CGRect)frame withAttributedString:(NSString *)text
{
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:text];
[attributedStr addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, attributedStr.length)];
UILabel *label = [WNController createLabelWithFrame:frame Font:NormalFont Text:nil];
label.attributedText = attributedStr;
label.textColor = [UIColor orangeColor];
return label;
}
24.给导航栏的标题设置文字的颜色,字体的大小
self.title = @"检查新版本";
//标题栏
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"topback.png"] forBarMetrics:UIBarMetricsDefault];
NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:KDefaultTitleViewTitleColor, NSForegroundColorAttributeName,
KDefaultTitleViewTitleFont, NSFontAttributeName, nil];
[[UINavigationBar appearance] setTitleTextAttributes:navbarTitleTextAttributes]
25,断网的判断及处理,要包含Reachability.h的头文件
Reachability *reach = [Reachability reachabilityWithHostName:@"www.baidu.com"];
NetworkStatus status = [reach currentReachabilityStatus];
if (status == NotReachable)
{
//没有连接到网络就弹出提实况
[[[UIAlertView alloc] initWithTitle:@"提示" message:@"网络连接失败,请稍后再试!" delegate:nil cancelButtonTitle:@"确认" otherButtonTitles:nil, nil] show];
return;
}
26.动态将UITableViewCell滚动到指定的cell
[_tableViewscrollToRowAtIndexPath:[NSIndexPathindexPathForRow:_messageArray.count-1inSection:0]atScrollPosition:UITableViewScrollPositionNoneanimated:YES];
27.一段文字设置行间距
commentLabel.textColor=UIColorFromRGB(0x333333,1.0);
//设置行间距
NSMutableAttributedString*attributedString = [[NSMutableAttributedStringalloc]initWithString:commentLabel.text];
NSMutableParagraphStyle*paragraphStyle = [[NSMutableParagraphStylealloc]init];
[paragraphStylesetLineSpacing:lineSpace];
[attributedStringaddAttribute:NSParagraphStyleAttributeNamevalue:paragraphStylerange:NSMakeRange(0, [attributedStringlength])];
//设置昵称颜色为橘黄色
28.签到动画
-(void)reallyStartAnimation
{
if ( !self.isCheckingIn )
{
self.checkImageView.image = [UIImage imageNamed:@"checkin-2"];
[self.checkBtn setTitle:@"签到中.." forState:UIControlStateNormal];
[self startAnimation];
self.isCheckingIn = YES;
}
}
-(void) startAnimation
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.01];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(endAnimation)];
self.checkImageView.transform = CGAffineTransformMakeRotation(self.angle * (M_PI / 180.0f));
[UIView commitAnimations];
}
-(void)endAnimation
{
self.angle += 10;
[self startAnimation];
}
29.给城市排序安装拼音
-(void)buildUpFirstLetterDictionary
{
self.citySortedCommunityDic = [[NSMutableDictionary alloc] initWithCapacity:16];
self.citySortedHeaderTitleIndexDic = [[NSMutableDictionary alloc] initWithCapacity:16];
for (City* city in self.cityDataSource.citys)
{
NSMutableArray* originalCommunityArray = [[NSMutableArray alloc] initWithCapacity:16];
for ( Community* community in city.communitys.communitys )
{
[originalCommunityArray addObject:community.name];
}
NSDictionary* dic = [originalCommunityArray sortedArrayUsingFirstLetter];
[self.citySortedCommunityDic setObject:dic forKey:city.name];
//因为字典的无序，将所有的key取出来之后，重新输出
NSArray *keys = [[dic allKeys] sortedArrayUsingSelector:@selector(compare:)];
[self.citySortedHeaderTitleIndexDic setObject:keys forKey:city.name];
}
}
/////
#import "NSArray+FirstLetterArray.h"
#import "pinyin.h"
@implementation NSArray (FirstLetterArray)
- (NSDictionary *)sortedArrayUsingFirstLetter
{
NSMutableDictionary *mutDic = [NSMutableDictionary dictionary];
const char *letterPoint = NULL;
NSString *firstLetter = nil;
for (NSString *str in self) {
//检查 str 是不是 NSString 类型
if (![str isKindOfClass:[NSString class]]) {
assert(@"object in array is not NSString");
#ifdef DEBUG
NSLog(@"object in array is not NSString, it's [%@]", NSStringFromClass([str class]));
#endif
continue;
}
letterPoint = [str UTF8String];
//如果开头不是大小写字母则读取 首字符
if (!(*letterPoint > 'a' && *letterPoint < 'z') &&
!(*letterPoint > 'A' && *letterPoint < 'Z')) {
//汉字或其它字符
char letter = pinyinFirstLetter([str characterAtIndex:0]);
letterPoint = &letter;
}
//首字母转成大写
firstLetter = [[NSString stringWithFormat:@"%c", *letterPoint] uppercaseString];
//首字母所对应的 姓名列表
NSMutableArray *mutArray = [mutDic objectForKey:firstLetter];
if (mutArray == nil) {
mutArray = [NSMutableArray array];
[mutDic setObject:mutArray forKey:firstLetter];
}
[mutArray addObject:str];
}
//字典是无序的，数组是有序的，
//将数组排序
for (NSString *key in [mutDic allKeys]) {
NSArray *nameArray = [[mutDic objectForKey:key] sortedArrayUsingSelector:@selector(compare:)];
[mutDic setValue:nameArray forKey:key];
}
return mutDic;
}
@end
30.发邮件,打电话，发短信，打开网址
30.1、调用 自带mail
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://admin@hzlzh.com”]];
30.2、调用 电话phone
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://8008808888"]];
iOS应用内拨打电话结束后返回应用
一般在应用中拨打电话的方式是：
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://123456789"]];
使用这种方式拨打电话时，当用户结束通话后，iphone界面会停留在电话界面。
用如下方式，可以使得用户结束通话后自动返回到应用：
UIWebView*callWebview =[[UIWebView alloc] init];
NSURL *telURL =[NSURL URLWithString:@"tel:10086"];// 貌似tel:// 或者 tel: 都行
[callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];
//记得添加到view上
[self.view addSubview:callWebview];
还有一种私有方法：（可能不能通过审核）
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"telprompt://10086"]];
30.3、调用 SMS
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://800888"]];
30.4、调用自带 浏览器 safari
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.hzlzh.com"]];
调用phone可以传递号码，调用SMS 只能设定号码，不能初始化SMS内容。
若需要传递内容可以做如下操作：
加入：MessageUI.framework
#import
实现代理：MFMessageComposeViewControllerDelegate
调用sendSMS函数
//内容，收件人列表
- (void)sendSMS:(NSString *)bodyOfMessage recipientList:(NSArray *)recipients
{
MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease];
if([MFMessageComposeViewController canSendText])
{
controller.body = bodyOfMessage;
controller.recipients = recipients;
controller.messageComposeDelegate = self;
[self presentModalViewController:controller animated:YES];
}
}
// 处理发送完的响应结果
- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{
[self dismissModalViewControllerAnimated:YES];
if (result == MessageComposeResultCancelled)
NSLog(@"Message cancelled")
else if (result == MessageComposeResultSent)
NSLog(@"Message sent")
else
NSLog(@"Message failed")
}
默认发送短信的界面为英文的，解决办法为：
在.xib 中的Localization添加一組chinese就ok了
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstStart"]){
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstStart"];
NSLog(@"第一次启动");
}else{
NSLog(@"不是第一次启动");
}
32.判断手机运营商
- (BOOL)checkChinaMobile
{
BOOL ret = NO;
CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
CTCarrier *carrier = [info subscriberCellularProvider];
if (carrier == nil)
{
[info release];
return NO;
}
NSString *code = [carrier mobileNetworkCode];
if (code == nil)
{
[info release];
return NO;
}
if ([code isEqualToString:@"00"] || [code isEqualToString:@"02"] || [code isEqualToString:@"07"])
{
ret = YES;
}
[info release];
return ret;
}
其它网络判断参考下表：
| MCC | MNC | Brand | Operator | Status | Bands (MHz) | References and notes |
|---|---|---|---|---|---|---|
| 460 | 00 | China Mobile | China Mobile | Operational | GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 2010 | |
| 460 | 01 | China Unicom | China Unicom | Operational | GSM 900 / GSM 1800 / UMTS 2100 | CDMA network sold to |
| 460 | 02 | China Mobile | China Mobile | Operational | GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 2010 | |
| 460 | 03 | China Telecom | China Telecom | Operational | CDMA2000 800 / CDMA2000 2100 | EV-DO |
| 460 | 05 | China Telecom | China Telecom | Operational | ||
| 460 | 06 | China Unicom | China Unicom | Operational | GSM 900 / GSM 1800 / UMTS 2100 | |
| 460 | 07 | China Mobile | China Mobile | Operational | GSM 900 / GSM 1800 / TD-SCDMA 1880 / TD-SCDMA 010 | |
| 460 | 20 | China Tietong | China Tietong | Operational | GSM-R |
33 NSData同步请求网络数据
+ (id)dataWithContentsOfURL:(NSURL *)url; + (id)dataWithContentsOfURL:(NSURL *)url options:(NSDataReadingOptions)readOptionsMask error:(NSError **)errorPtr; 其中NSDataReadingOptions可以附加一个参数。NSDataReadingMappedIfSaf e参数。使用这个参数后，iOS就不会把整个文件全部读取的内存了，而是将文件映射到进程的地址空间中，这么做并不会占用实际内存。这样就可以解决内存满的问题。 补充： url包含中文时，直接使用会出错，需要如下转换 NSURL *url = [NSURL URLWithString:[self.curTaskData.urlstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
34view和window之间坐标转换
在某UIView子函数内部，将centerPoint从子view坐标转换成appDelegate.window内的坐标：
CGPointcenterPoint = [selfgetCenterPointByCurPressPoint:pressPointer];
centerPoint = [selfconvertPoint:centerPointtoView:appDelegate.window];
35.ViewController的生命周期
loadView和viewDidLoad的区别就是，loadView时view还没有生成，viewDidLoad时，view已经生成了，loadView只会被调用一次，而viewDidLoad可能会被调用多次（View可能会被多次加载），当view被添加到其他view中之前，会调用viewWillAppear，之后会调用viewDidAppear。当view从其他view中移除之前，调用viewWillDisAppear，移除之后会调用viewDidDisappear。当view不再使用时，受到内存警告时，ViewController会将view释放并将其指向为nil。
ViewController的生命周期中各方法执行流程如下：
init—>loadView—>viewDidLoad—>viewWillApper—>viewDidApper—>viewWillDisapper—>viewDidDisapper—>viewWillUnload->viewDidUnload—>dealloc
36程序启动原理
UIApplication和delegate
所有的移动操作系统都有个致命的缺点:app很容易受到打扰.比如一个来电或者锁屏会导致app进入后台甚至被终止;
还有很多其他类似的情况会导致app受到干扰,在app受到干扰时,会产生一些系统事件,这时UIApplication会通知它的delegate对象,让delegate来处理这些系统事件.
delegate可处理的事件包括:
1> 应用程序的生命周期事件(如程序的启动和关闭);
2> 系统事件(如来电);
3> 内存警告...
UIWindow的获得:
| 1 | [UIApplicationsharedApplication].windows |
在本应用中打开的UIWindow列表,这样就可以接触应用中的任何一个UIView对象(平时输入文字弹出的键盘,就处在一个新的UIWindow中).
| 1 | [UIApplicationsharedApplication].keyWindow |
用来接收键盘以及非触摸类的消息事件的UIWindow,而且程序中每时每刻只能有一个UIWindow是keyWindow.如果某个UIWindow内部的文本框不能输入文字,可能是因为这个UIWindow不是keyWindow.
| 1 | view.window |
获得某个UIView所在的UIWindow.
37.UITableViewCell 文字位置调整
继承UITableViewCell，然后实现layoutSubviews函数，如下代码把textlabel下移了10个像素：
- (void) layoutSubviews
{
[superlayoutSubviews];
intcellHeight =self.frame.size.height;
intcellWidth =self.frame.size.width;
self.textLabel.frame=CGRectMake(0,10,cellWidth, cellHeight-10);
}
38.ios带圆角图片的拉伸
UIImage* aImage =[[UIImageimageNamed:@"xxx.png"]stretchableImageWithLeftCapWidth:3topCapHeight:3];
原图边框内的3个像素不拉伸，中间部分按需要拉伸，可以保持圆角不被破坏
39自定义UINavigtion
1如果只是要更改left button 或者right button 的背景颜色：
UINavigationBar* aNavigationBar = self.navigationController.navigationBar;
aNavigationBar.tintColor = [UIColor lightGrayColor];
2，如果要自定义left button 或者right button 的背景图片：
UIButton* backButton = [customNavigationBar backButtonWith:[UIImage imageNamed:@"navigationBarBackButton.png"] highlight:nilleftCapWidth:14.0];
backButton.titleLabel.textColor = [UIColor colorWithRed:254.0/255.0 green:239.0/255.0 blue:218.0/225.0 alpha:0.5];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease];
3,如果要自定义navigation整个的背景图片：
1，自定义navigationbar，然后在这个自定义类中实现如下函数
- (void)drawRect:(CGRect)rect
{
if (navigationBarBackgroundImage)
[navigationBarBackgroundImage drawInRect:rect];
else
[super drawRect:rect];，如果只是要更改left button 或者right button 的背景颜色：
UINavigationBar* aNavigationBar = self.navigationController.navigationBar;
aNavigationBar.tintColor = [UIColor lightGrayColor];
2，如果要自定义left button 或者right button 的背景图片：
UIButton* backButton = [customNavigationBar backButtonWith:[UIImage imageNamed:@"navigationBarBackButton.png"] highlight:nilleftCapWidth:14.0];
backButton.titleLabel.textColor = [UIColor colorWithRed:254.0/255.0 green:239.0/255.0 blue:218.0/225.0 alpha:0.5];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease];
3,如果要自定义navigation整个的背景图片：
1，自定义navigationbar，然后在这个自定义类中实现如下函数
- (void)drawRect:(CGRect)rect
{
if (navigationBarBackgroundImage)
[navigationBarBackgroundImage drawInRect:rect];
else
[super drawRect:rect];