本文转载至 http://www.cnblogs.com/chivas/archive/2012/05/21/2512324.html

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 = [[UIImageView alloc] initWithFrame:CGRectMake(0.0,45.0,300,300)];

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

[self.view addSubView:image];

[imageView release];

//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[UIImage imageWithContentsOfFile]解决掉这个问题.

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

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

如：

1、》》》

UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];

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

2、》》》

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

NSImage *myImage = [UIImage imageWithContentsOfFile:path];

//让一个UIImageView响应点击事件
  
UIImageView *imgView =[[UIImageView alloc] initWithFrame:CGRectMake(0, 0,320, 44)];
imgView.userInteractionEnabled=YES;
UITapGestureRecognizer *singleTap =[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(onClickImage)];
[imgView addGestureRecognizer:singleTap];
[singleTap release];

-(void)onClickImage{
   // here, do whatever you wantto do
    NSLog(@"imageview is clicked!");
}