//第一种方法:最常用的方法,但是性能最差
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; UIImageView *imageV
//第一种方法:最常用的方法,但是性能最差
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; UIImageView *imageV