UIImage 设置填充色，pop的时候变成gray

    UIImage *image = [UIImage imageNamed:@"icon.png"];

    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height)];

 imageView.tintColor = [UIColor redColor];

 //只需要设置下面的属性即可

imageView.tintAdjustmentMode = UIViewTintAdjustmentModeNormal;