ios代码改变图片的颜色
UIImage *image = [UIImage imageNamed:@"qr-code"];
self.ImageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[image setTintColor:[UIColor whiteColor]];
iOS背景透明
self.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.02];
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