wpp项目的一些记录

1.如果viewController都是通过push和pop来管理的，那rootViewController相当是个单例了，可以考虑写成单例

2.一个button通过addtarget添加响应事件后，响应的函数参数(id)sender就是那个view，通过view的subviews和super可以得到相应的父view和子view进行view的管理，而不需要去写成成员变量进行管理

3.删除view时，先进行removeFromSuperview，在release和置为nil

4.button的相应事件一般定义在点击时（UIControlEventTouchDown）和点击后UIControlEventTouchUpInside，第一个常用在点击时ui上的变化，第二个常用于点击后按钮响应的事件

5.view在设置背景图时，为了高清图自适应view大小，可以选择在view上add一个UIImageView，在设置view的setBackImageView

6.view subviews得到所有子view，通过view isKindOfClass:[xxx class] 判断view的类型，如此获取相应的view，当然也可通过view的大小或者其他属性判断

7.当你需要为当前的响应添加一个view时，并且需要提醒的view不受其他view的push或者pop的影响，可以选择把view通过[UIApplication shaApplication].keyWindow addSubview:xxx 添加到window上

8.有时候创建好的UIActivityIndicatorView想立即弹出显示，可以选择将主线程挂起0.00001s，通过performSelector 中的afterDelay:0.00001阻塞主线程，马上让出cpu时间让菊花弹出

9.label setFont:[UIFont boldSystemFontOfSize(加粗):18]；非加粗systemFontOfSize

10.让输入框第一个输入位置不紧挨着左边：

    {
        UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 19)];
        self.inputField.leftView = paddingView;
        [paddingView release];
        self.inputField.leftViewMode = UITextFieldViewModeAlways;
    }

UITextFiled常用设置：

    NSString *defaultStr = getMulNSStr([NSString stringWithFormat:@"SHARE_PLAY_CODE"],localFileName);
    [self.inputField setPlaceholder:defaultStr];
    if (!isPhone())
    {
        [self.inputField becomeFirstResponder];
    }
    self.inputField.keyboardType = UIKeyboardTypePhonePad;//UIKeyboardTypeNumbersAndPunctuation;
    self.inputField.contentVerticalAlignment = (UIControlContentVerticalAlignment)UIControlContentHorizontalAlignmentCenter;
//    self.inputField.secureTextEntry = YES;
    [self.inputField setEnablesReturnKeyAutomatically:YES];
    [self.inputField setReturnKeyType:UIReturnKeyDone];
    [self.inputField setDelegate:(id)self];
    [self.inputField addTarget:self action:@selector(accessCodeTextFiledDone:) forControlEvents:UIControlEventEditingDidEndOnExit];
    [self.bgView addSubview:self.inputField];

11.添加gif动画：

- (void) addProgressBarGif
{
    NSData *progressGifData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:PUBLIC_PROGRESS_BAR_GIF_IPAD3 ofType:@"gif"]];
    UIWebView *gifWebView = [[[UIWebView alloc] initWithFrame:CGRectMake((62+14)/2, 424/4-30/4.f, 524/2, 30/2)] autorelease];
    gifWebView.userInteractionEnabled = NO;
    [gifWebView loadData:progressGifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
    [self.bgView addSubview:gifWebView];
}

12.keyboard的显示和隐藏事件：

- (void)addKeyboardEvents
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)removeKeyboardEvents
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)keyboardWillShow:(NSNotification *)notification
{
    if (bgButton == nil)
    {
        self.bgButton = [[[UIButton alloc] initWithFrame:self.bounds] autorelease];
        [self.bgButton setBackgroundColor:[UIColor clearColor]];
        [self.bgButton addTarget:self action:@selector(keyboardWillHide:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:self.bgButton];
        [self bringSubviewToFront:self.bgView];
    }
    else
    {
        [self.bgButton setEnabled:YES];
    }

    if (self.keyBoardInfo == nil)
    {
        self.keyBoardInfo = [notification userInfo];
    }
    
    NSValue* aValue = [self.keyBoardInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    
    CGRect keyboardRect = [aValue CGRectValue];
    keyboardRect = [self convertRect:keyboardRect fromView:nil];
    
    CGFloat keyboardTop = keyboardRect.size.height;
    CGRect newTextViewFrame = self.bgView.frame;
    if (isPhone())
    {
        if (self.bgView.frame.size.height == 424/2)
        {
            newTextViewFrame.origin.y = - self.bgView.frame.origin.y + 20;
        }
        else
        {
            newTextViewFrame.origin.y = - self.bgView.frame.origin.y - 40;
        }
    }
    else
    {
        newTextViewFrame.origin.y = keyboardTop - self.bgView.frame.origin.y;
    }
    
    NSValue *animationDurationValue = [self.keyBoardInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];
    
    self.bgView.frame = newTextViewFrame;
    
    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification *)notification
{
    if ([self.bgButton isEnabled])
    {
        [self.bgButton setEnabled:NO];
        [self.inputField resignFirstResponder];
    }
//    NSDictionary* userInfo = [notification userInfo];
    if (self.keyBoardInfo == nil)
    {
        self.keyBoardInfo = [notification userInfo];
    }
    
    NSValue *animationDurationValue = [self.keyBoardInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];
    
    if (isPhone())
    {
        [self.bgView setFrame:CGRectMake(self.bgView.frame.origin.x, IPHONE_ITOUCH_4_4S_HEIGHT/2 - self.bgView.frame.size.height/2, self.bgView.frame.size.width, self.bgView.frame.size.height)];
    }
    else
    {
        [self.bgView setFrame:CGRectMake(self.bgView.frame.origin.x, IPAD_2_3_HEIGHT/2 - self.bgView.frame.size.height/2, self.bgView.frame.size.width, self.bgView.frame.size.height)];
    }
    
    [UIView commitAnimations];
}

12.textFiled常用的delegate要清楚：

- (BOOL)textFieldShouldReturn:(UITextField *)textField

- (void)textFieldDidBeginEditing:(UITextField *)textField

13.设置button上的文字：

self.closeButton.titleLabel.adjustsFontSizeToFitWidth = YES;
    self.closeButton.titleLabel.text = getMulNSStr([NSString stringWithFormat:@"PREVIEW_CLOSEBTN"],localFileName);
    if (isPhone())
    {
        [self.closeButton.titleLabel setFont:[UIFont boldSystemFontOfSize:12.f]];
    }

[self.closeButton setTitleColor:[UIColor colorWithRed:115.f/255.f green:84.f/255.f blue:17.f/255.f alpha:1.0f] forState:UIControlStateNormal];

14.layer可通过zPosition设置上下层位置，view通过sendSubviewToBack和bringSubviewToFront设置上下层view的关系

15.当前view只支持横屏

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft ||
    [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeRight;
}

16.label的属性，label中的文字填满后自动填充 ... 的属性：
titleName = [titleName stringByDeletingPathExtension];

17.用通知解耦合：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refreshSlide:) name:kNotificationRefreshSlide object:nil];

[[NSNotificationCenter defaultCenter] removeObserver:self name:kNotificationRefreshSlide object:nil];

使用时请仔细揣摩一对多，多对一的关系

18.使用ios的手势时，千万记得在手势的响应事件中添加当前手势的状态判断，否则这个函数后被调用很多遍：

if (recognizer.state == UIGestureRecognizerStateEnded)

19.用调用delegate的方法时，请先判断方法是否能到达，增强代码的健壮性：

if ([self.refreshSlideAndCellDelegate respondsToSelector:@selector(gotoSelectThumbnail:beforIndex:)])
        {
            [self.refreshSlideAndCellDelegate gotoSelectThumbnail:prevSlide beforIndex:index];
        }

20.使用row创建NSIndexPath时，你是不是常常没有加inSection,这是个隐患：

NSIndexPath *nextSlide = [NSIndexPath indexPathForRow:indexinSection:0];
21.scrollview一般的初始化：

- (void)initSlideScrollView
{
    slideScrollView = [[[UIScrollView alloc] initWithFrame:self.view.bounds] autorelease];
    slideScrollView.contentSize = slideImageView.frame.size;
    m_zoneSize = slideScrollView.contentSize;
    [slideScrollView addSubview:slideImageView];
    
    [slideScrollView setMinimumZoomScale:1.0];
    [slideScrollView setMaximumZoomScale:2.5];
    [slideScrollView setBounces:NO];
    slideScrollView.bouncesZoom = NO;
    slideScrollView.decelerationRate = 0.1f;
    
    [slideScrollView setDelegate:self];
    [slideScrollView setShowsVerticalScrollIndicator:NO];
    [slideScrollView setShowsHorizontalScrollIndicator:NO];
    [self.view addSubview:slideScrollView];
}

22.当你决定手动调用drawRect方法时，那你就应该disable掉自动调用这种隐患：

-(void)drawRect:(CGRect)rect

{
if (isNeedDrawRect)

{

.....
}
}

-(void)needDrawRect:(CGRect)rect

{
isNeedDrawRect = YES;

[self drawRect:rect];

isNeedDrawRect = NO;

}

23.initWithCGImage要小心啊，这玩意去创建UImage，真不保险

24.线程的等待和唤醒功能，在同步中实用：

- (void)conditionWait:(NSCondition*)threadCondition
{
    [threadCondition lock];
    [threadCondition wait];
    [threadCondition unlock];
}

- (void)conditionSignal:(NSCondition*)threadCondition
{
    [threadCondition lock];
    [threadCondition signal];
    [threadCondition unlock];
}

25.简单的动画用view实现也不错：

- (void)zoomImageView:(UIImageView*)imageView mark:(NSString*)markAnim
{
    [UIView beginAnimations:markAnim context:nil];
    
    [UIView setAnimationDuration:0.2];
    
    [UIView setAnimationDelegate:self];

    CGAffineTransform newTransform =  CGAffineTransformScale(imageView.transform, _minimumPageScale, _minimumPageScale);
    [imageView setTransform:newTransform];
    
    [UIView commitAnimations];
}

动画结束后执行的，有这个delegate：

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context

动画都是非阻塞的，动画时应该屏蔽屏幕的点击事件：

self.view.userInteractionEnabled = NO;

26.文件大小，创建者等信息：

NSString *fileMsg = nil;
    NSError* error;
    NSDictionary* fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:&error];
    if (fileAttributes != nil)
    {
        NSNumber *fileSize;
        NSString *fileOwner, *creationDate, *filesizeStr;
        NSDate *fileModDate;
        
        //文件大小
        fileSize = [fileAttributes objectForKey:NSFileSize];
        double size = [fileSize doubleValue];

        NSString* strFileInfoFormat = nil;
        if (size <= 0) {
            filesizeStr = [NSString stringWithFormat : @""];
        }
        if(size < 1024)
        {
            strFileInfoFormat = @"%0.0f B";
        }
        else
        {
            size /= 1024.f;
            if (size < 1024)
            {
                strFileInfoFormat = @"%0.1f KB";
            }
            else
            {
                size /= 1024.f;
                if (size < 1024)
                    strFileInfoFormat = @"%0.1f MB";
                else
                {
                    size /= 1024.f;
                    strFileInfoFormat = @"%0.1f GB";
                }
            }
            
        }
        filesizeStr = [NSString stringWithFormat : strFileInfoFormat, size];
        
        //文件创建日期
        creationDate = [NSString stringWithFormat:@"%@",[fileAttributes objectForKey:NSFileCreationDate]];

        //文件所有者
        fileOwner = [NSString stringWithFormat:@"%@",[fileAttributes objectForKey:NSFileOwnerAccountName]];
        
        //文件修改日期
        fileModDate = [fileAttributes objectForKey:NSFileModificationDate];
        
        NSTimeZone *zone = [NSTimeZone systemTimeZone];
        NSInteger interval = [zone secondsFromGMTForDate:fileModDate];
        fileModDate = [fileModDate dateByAddingTimeInterval:interval];
        
        NSString *fileData = [NSString stringWithFormat:@"%@", fileModDate];
        fileData = [fileData substringToIndex:16];
        
        NSString *wordDate = getMulNSStr([NSString stringWithFormat:@"PHOTOWALL_LAST_MODIFIED"],localFileName);
        
        fileMsg = [NSString stringWithFormat:@"%@   %@ %@", filesizeStr, wordDate, fileData];
    }

27.代码强耦合，设计模式是软肋啊。。。