imageView 的高亮状态

imageView 可以设置高亮状态,若是设置 imageView 的高亮状态

@property (nullable, nonatomic, strong) UIImage *highlightedImage NS_AVAILABLE_IOS(3_0); // default is nil

@property (nonatomic, getter=isHighlighted) BOOL highlighted NS_AVAILABLE_IOS(3_0); // default is NO

就是设置 highlighted = YES;