// 1.不缓存,适合加载不常用大图
UIImage *img = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Default" ofType:@"png"]];
// 2.缓存,适合加载常用的小图
UIImage *img = [UIImage imageNamed:@"Default.png"];
// 1.不缓存,适合加载不常用大图
UIImage *img = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Default" ofType:@"png"]];
// 2.缓存,适合加载常用的小图
UIImage *img = [UIImage imageNamed:@"Default.png"];