使用UIImageView展现来自网络的图片

UIImageView：可以通过UIImage加载图片赋给UIImageView，加载后你可以指定显示的位置和大小。
1、初始化

UIImageView*imageView=[[UIImageViewalloc]initWithFrame:CGRectMake(0.0,45.0,300,300)];

imageView.image=[UIImageimageNamed:@"a.png"];//加载入图片

[self.viewaddSubView:image];

[imageViewrelease];

//imageNamed方法是不能通过路径进行加载图片的，此方式容易引起发生内存警告从而导致自动退出的问题。

//最好是通过直接读取文件路径[UIImageimageWithContentsOfFile]解决掉这个问题.

NSImage*image=[[NSImagealloc]initWithContentsOfURL:(NSURL*)];

NSImage*image=[[NSImagealloc]initWithContentsOfFile:(NSString*)];

如：
1、》》》

UIImage*image=[[UIImagealloc]initWithData:[NSDatadataWithContentsOfURL:[NSURLURLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];

UIImageView*imageView=[[UIImageViewalloc]initWithImage:image];

2、》》》

NSString*path=[[NSBundlemainBundle]pathForResource:@”icon”ofType:@”png”];

NSImage*myImage=[UIImageimageWithContentsOfFile:path];

//让一个UIImageView响应点击事件

UIImageView*imgView=[[UIImageViewalloc]initWithFrame:CGRectMake(0,0,320,44)];

imgView.userInteractionEnabled=YES;

UITapGestureRecognizer*singleTap=[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(onClickImage)];

[imgViewaddGestureRecognizer:singleTap];

[singleTaprelease];

-(void)onClickImage{

//here,dowhateveryouwanttodo

NSLog(@"imageviewisclicked!");

}