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
}
