用分类解决iOS图片被渲染问题

UIImage的category

.h文件

+ (instancetype)imageWithOriginalName:(NSString*)imageName;

.m文件

+ (instancetype)imageWithOriginalName:(NSString*)imageName

{

   UIImage*image = [UIImage imageNamed:imageName];

    return  [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

}