我正在try 使用样式为.actionSheet的默认AlertViewController.由于某些原因,alert 会导致constraint error.只要alert tController不是通过按钮触发(显示)的,整个视图上就没有约束错误.会不会这是一架bug of Xcode?
我得到的确切错误如下所示:
2019-04-12 15:33:29.584076+0200 Appname[4688:39368] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x6000025a1e50 UIView:0x7f88fcf6ce60.width == - 16 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6000025a1e50 UIView:0x7f88fcf6ce60.width == - 16 (active)>
这是我使用的代码:
@objc func changeProfileImageTapped(){
print("ChangeProfileImageButton tapped!")
let alert = UIAlertController(title: "Change your profile image", message: nil, preferredStyle: .actionSheet)
alert.addAction(UIAlertAction(title: "Photo Library", style: .default, handler: nil))
alert.addAction(UIAlertAction(title: "Online Stock Library", style: .default, handler: nil))
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
alert.view.tintColor = ColorCodes.logoPrimaryColor
self.present(alert, animated: true)
}
如你所见,它是very basic.这就是为什么我对自己的奇怪行为感到非常困惑,因为这default implementation应该不会导致任何错误,对吧?
不过,通过打破限制,alert 可以在所有尺寸的屏幕上正确显示,我将非常感谢得到的任何帮助.