ios23- 文件下载（同步和异步）
1.第一步：创建一个单例视图
#import <uikit/uikit.h>
@interface ios23_downviewcontroller : uiviewcontroller<nsurlconnectiondelegate,nsurlconnectiondatadelegate>{
nsmutabledata *connectiondata;
}
-(ibaction)tongbu;
-(ibaction)yibu;
@property (nonatomic,retain) nsmutabledata *connectiondata;
@end
2
//
// ios23_downviewcontroller.m
// ios23-down
//
// created by on 13-6-17.
// copyright 2013年 __mycompanyname__. all rights reserved.
//
#import "ios23_downviewcontroller.h"
@implementation ios23_downviewcontroller
@synthesize connectiondata;
- (void)didreceivememorywarning
{
[super didreceivememorywarning];
// release any cached data, images, etc that aren't in use.
}
#pragma mark - view lifecycle
-(ibaction)tongbu{
nslog(@"同步");
nserror *err;
//定义url
nsstring ";
//构建nsurl
nsurl *fileurl=[nsurl urlwithstring:url];
//构建nsurlrequest
nsurlrequest *request=[[nsurlrequest alloc]initwithurl:fileurl];
//建立连接
nsdata *data=[nsurlconnection sendsynchronousrequest:request returningresponse:nil error:&err];
if (data.length>0) {
nsstring *savepath=[[nshomedirectory()stringbyappendingpathcomponent:@"documents"]stringbyappendingpathcomponent:@"test.zip"];
//当数据写入的时候
if ([data writetofile:savepath atomically:yes]) {
nslog(@"保存成功");
}else{
nslog(@"保存失败");
}
}
}
-(ibaction)yibu{
nslog(@"异步");
nserror *err;
//定义url
nsstring ";
//构建nsurl
nsurl *fileurl=[nsurl urlwithstring:url];
//构建nsurlrequest
nsurlrequest *request=[[nsurlrequest alloc]initwithurl:fileurl];
//建立连接
nsdata *data=[nsurlconnection sendsynchronousrequest:request returningresponse:nil error:&err];
nsurlconnection *conn=[[nsurlconnection alloc]initwithrequest:request delegate:self];
//初始化connectiondata;
connectiondata=[[nsmutabledata alloc]init ];
}
//接受数据
-(void)connection:(nsurlconnection *)connection didreceivedata:(nsdata *)data{
//获取服务器传递的数据
[connectiondata appenddata:data];
}
//接收数据成功
-(void)connectiondidfinishloading:(nsurlconnection *)connection{
if (connectiondata.length>0) {
nsstring *savepath=[[nshomedirectory()stringbyappendingpathcomponent:@"documents"]stringbyappendingpathcomponent:@"test.zip"];
//当数据写入的时候
if ([connectiondata writetofile:savepath atomically:yes]) {
nslog(@"保存成功");
}else{
nslog(@"保存失败");
}
}}
//接收数据失败
-(void)connection:(nsurlconnection *)connection didfailwitherror:(nserror *)error{}
- (void)viewdidload
{
[super viewdidload];
// do any additional setup after loading the view, typically from a nib.
}
- (void)viewdidunload
{
[super viewdidunload];
// release any retained subviews of the main view.
// e.g. self.myoutlet = nil;
}
- (void)viewwillappear:(bool)animated
{
[super viewwillappear:animated];
}
- (void)viewdidappear:(bool)animated
{
[super viewdidappear:animated];
}
- (void)viewwilldisappear:(bool)animated
{
[super viewwilldisappear:animated];
}
- (void)viewdiddisappear:(bool)animated
{
[super viewdiddisappear:animated];
}
- (bool)shouldautorotatetointerfaceorientation:(uiinterfaceorientation)interfaceorientation
{
// return yes for supported orientations
return (interfaceorientation != uiinterfaceorientationportraitupsidedown);
}
@end