UIImageRenderingMode

typedef NS_ENUM(NSInteger, UIImageRenderingMode) {
    UIImageRenderingModeAutomatic,          // Use the default rendering mode for the context where the image is used
    
    UIImageRenderingModeAlwaysOriginal,     // Always draw the original image, without treating it as a template
    UIImageRenderingModeAlwaysTemplate,     // Always draw the image as a template image, ignoring its color information
} NS_ENUM_AVAILABLE_IOS(7_0);

渲染的時候

UIImageRenderingModeAutomatic， //爲使用圖像的上下文使用默認呈現模式

UIImageRenderingModeAlwaysOriginal， //總是繪製原始圖像，不把它當作模板
UIImageRenderingModeAlwaysTemplate， //總是將圖像繪製爲模板圖像，忽略它的顏色信息