我想知道怎样才能用这样的按钮创建一个弹出窗口。
答案:
UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil
delegate: self
cancelButtonTitle: nil
destructiveButtonTitle: nil
otherButtonTitles: @"Take Photo",
@"Choose Existing Photo", nil];
[actionSheet showFromRect: button.frame inView: button.superview animated: YES];
在您的委托对象类中的其他位置...
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) {
// take photo...
}
else if (buttonIndex == 1) {
// choose existing photo...
}
}
发布于 2012-05-25 03:56:13
这是一个UIActionSheet
。在iPhone上,它从底部开始设置动画。在iPad上,它会出现在弹出窗口中。
假设您是在按下一个按钮时执行此操作:
UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil
delegate: self
cancelButtonTitle: nil
destructiveButtonTitle: nil
otherButtonTitles: @"Take Photo",
@"Choose Existing Photo", nil];
[actionSheet showFromRect: button.frame inView: button.superview animated: YES];
在iOS8+中,您应该使用新的UIAlertController
类:
UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil
message: nil
preferredStyle: UIAlertControllerStyleActionSheet];
[alertController addAction: [UIAlertAction actionWithTitle: @"Take Photo" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
// Handle Take Photo here
}]];
[alertController addAction: [UIAlertAction actionWithTitle: @"Choose Existing Photo" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
// Handle Choose Existing Photo here
}]];
alertController.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController * popover = alertController.popoverPresentationController;
popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
popover.sourceView = sender;
popover.sourceRect = sender.bounds;
[self presentViewController: alertController animated: YES completion: nil];
或在Swift中
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
alertController.addAction(UIAlertAction(title: "Take Photo", style: .Default, handler: { alertAction in
// Handle Take Photo here
}))
alertController.addAction(UIAlertAction(title: "Choose Existing Photo", style: .Default, handler: { alertAction in
// Handle Choose Existing Photo
}))
alertController.modalPresentationStyle = .Popover
let popover = alertController.popoverPresentationController!
popover.permittedArrowDirections = .Up
popover.sourceView = sender
popover.sourceRect = sender.bounds
presentViewController(alertController, animated: true, completion: nil)
https://stackoverflow.com/questions/10744260
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