我使用以下代码将自定义图像放入backIndicator
Image中：
- var backButton = UIImage(named: "locationbar_back")?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
- self.navigationController!.navigationBar.backIndicatorImage = backButton
- self.navigationController!.navigationBar.backIndicatorTransitionMaskImage = backButton
图像略高于标准图形,所以我想要垂直居中.
我已经尝试在导航栏中找到图像(不是很优雅)使用这个代码(任何更好的建议欢迎)：
- for myview in self.navigationController!.navigationBar.subviews as [UIView]
- {
- if myview.frame.width == 17 //need a better way of identifying object
- {
- var newFrame = myview.frame
- newFrame.origin.y = 6.0
- myview.frame = newFrame
- }
- }
令人沮丧的是,图像暂时在正确的地方出现,然后被恢复到原来的位置.
我试过这样说：
> viewDidLoad
> viewWillLayoutSubviews
> viewDidLayoutSubviews
> viewDidAppear
没有快乐
有没有任何建议吗？
您可以通过下一个代码直接更改您的UIImage位置.
原产地可以手动设置：
原产地可以手动设置：
- ...
- var backButtonImage = UIImage(named: "backButtonImage")!
- backButtonImage = changeImagePosition(backButtonImage,origin: CGPointMake(0,0))
- navigationController!.navigationBar.backIndicatorImage = backButtonImage
- navigationController!.navigationBar.backIndicatorTransitionMaskImage = backButtonImage
- ...
- func changeImagePosition(image: UIImage,origin: CGPoint) -> UIImage {
- let size = image.size
- UIGraphicsBeginImageContextWithOptions(size,false,2)
- image.drawInRect(CGRectMake(origin.x,origin.y,size.width,size.height))
- let newImage = UIGraphicsGetImageFromCurrentImageContext()
- UIGraphicsEndImageContext()
- return newImage
- }
