下载图片

{

UIImageView *vi;

}

{

[super viewDidLoad];

//设置按钮

UIButton *bu=[[UIButton alloc]initWithFrame:CGRectMake(40, 40, 150, 44)];

[bu setTitle:@"下载图片" forState:UIControlStateNormal];

[bu addTarget:self action:@selector(fan) forControlEvents:UIControlEventTouchUpInside];

bu.backgroundColor=[UIColor redColor];

[self.view addSubview:bu];

vi=[[UIImageView alloc]initWithFrame:CGRectMake(40, 120, 300, 200)];

[self.view addSubview:vi];

}

-(void)fan

{

NSString *str=[NSString stringWithFormat:@"http://pic1.zhimg.com/v2-7f69a4fc4a0aa84178074d83aef7ac30_r.jpg"];

NSURL *url=[NSURL URLWithString:str];

NSURLRequest *req=[[NSURLRequest alloc]initWithURL:url];

NSURLResponse *resq=[[NSURLResponse alloc]init];

NSData *da=[NSURLConnection sendSynchronousRequest:req returningResponse:&resq error:nil];

vi.image=[UIImage imageWithData:da];

}