我有两个按钮。除了其中一个图像被翻转之外,它们都具有相同的图像。如果可以以编程方式创建图像,我不想在我的应用程序包中包含多余的图像,所以我创建这样的按钮:
UIImage *forwardImage = [UIImage imageNamed:rewind_btn_img];
UIImage *rewindImage = [UIImage imageWithCGImage:forwardImage.CGImage
scale:forwardImage.scale
orientation:UIImageOrientationUpMirrored];
NSArray *images = @[rewindImage, forwardImage];
for (int i = 0; i < 2; i++)
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image = images[i];
btn.frame = CGRectMake(0.f, 0.f, image.size.width, image.size.height);
btn.center = CGPointMake(self.playButton.center.x + (i == 0 ? - 80.f : 80.f) * TGScaleMultiplier, self.playButton.center.y);
btn.tag = i + 1;
[btn setBackgroundImage:image forState:UIControlStateNormal];
[btn addTarget:self actionselector(rewindButtonClicked forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
问题是,当我按下图像为 rewindImage
的按钮时,它会显示原始图像,并翻转到另一侧。我在这里做错了吗?有什么解决办法吗?
不确定为什么 UIImage:imageWithCGImage 是片状的,但我尝试了另一种镜像图像的方法,当应用于按钮时效果很好。所以摆脱 UIImage:imageWithCGImage 线并使用这个:
UIImage *rewindImageBase = [UIImage imageNamed:rewind_btn_img];
UIGraphicsBeginImageContext(rewindImageBase.size);
CGContextRef current_context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(current_context, rewindImageBase.size.width, 0);
CGContextScaleCTM(current_context, -1.0, 1.0);
[rewindImageBase drawInRect:CGRectMake(0, 0, rewindImageBase.size.width, rewindImageBase.size.height)];
UIImage *rewindImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
应该可以的。
关于ios - UIButton 在高亮状态下更改代码中创建的图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24615115/
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