在iOS 9上进行演示之前，UIPopoverPresentationController应设置非nil sourceView或barButtonItem
我正在尝试使用自定义的UIPopoverPresentationController类显示弹出窗口。但是它崩溃了，错误是下面的(<UIPopoverPresentationController: 0x7a772950>) should have a non-nil sourceView or barButtonItem set before the presentation occurs. is my button click code is my button click code where the crash。
- (IBAction)showPopup:(UIButton *)sender {
ViewController *contentViewController = [[ViewController alloc] init];
contentViewController.preferredContentSize = CGSizeMake(200, 200);
contentViewController.modalPresentationStyle = UIModalPresentationPopover;
myPopoverController *popOver = [[myPopoverController alloc]initWithPresentedViewController:contentViewController presentingViewController:self andTintColor:[UIColor lightGrayColor]];
popOver.delegate = self;
popOver.permittedArrowDirections = UIPopoverArrowDirectionUp;
popOver.sourceRect = sender.frame;
popOver.sourceView = self.view;
[self presentViewController:contentViewController animated: YES completion: nil];
}下面是我的自定义UIPopoverPresentationController的样例
myPopoverController.h file
@interface myPopoverController : UIPopoverPresentationController
@property (readonly) UIColor *tintColor;
-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController andTintColor:(UIColor *)aTintColor;
@end
myPopoverController.m file
//Some code for UIPopoverBackgroundView
-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController
{
self = [self initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController andTintColor: [UIColor redColor]];
return self;
}
-(instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController andTintColor:(UIColor *)aTintColor
{
self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController];
if (!self) {
return nil;
}
[super setPopoverBackgroundViewClass: [myPopoverControllerBackgroundView class]];
tintColor = aTintColor;
return self;
}我没有工具栏按钮，但我正在设置sourceView。我是不是做错了什么？感谢您的帮助
回答 6
Stack Overflow用户
发布于 2017-04-07 22:24:06
你也可以像这样创建一个popover展示控制器，它可能会工作
- (IBAction)showPopup:(UIButton *)sender {
ViewController *contentViewController = [[ViewController alloc] init];
contentViewController.preferredContentSize = CGSizeMake(200, 200);
contentViewController.modalPresentationStyle = UIModalPresentationPopover;
UIPopoverPresentationController *popoverpresentationController = contentViewController.popoverPresentationController;
popoverpresentationController.delegate = self;
popoverpresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
popoverpresentationController.sourceRect = sender.bounds;
popoverpresentationController.sourceView = sender;
[self presentViewController:contentViewController animated: YES completion: nil];
}Stack Overflow用户
发布于 2017-07-27 17:37:36
你对UIPopoverPresentationController进行了子类化，但苹果recommends却使用了原样。一旦您提供了一个UIViewController，系统将自动创建一个UIPopoverPresentationController，并且您应该根据需要对其进行修改。
你创建了一个myPopoverController实例，但当你present你的contentViewController之后，苹果又创建了另一个实例：
[self presentViewController:contentViewController animated: YES completion: nil];这个新的UIPopoverPresentationController缺少sourceView并抛出一个异常。
请尝试下面的代码：
ViewController *contentViewController = [[ViewController alloc] init];
// Present the view controller using the popover style.
contentViewController.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:contentViewController
animated:YES
completion:nil];
// Get the popover presentation controller and configure it.
UIPopoverPresentationController *presentationController =[contentViewController popoverPresentationController];
presentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
presentationController.sourceView = self.view;
presentationController.sourceRect = sender.frame;Stack Overflow用户
发布于 2021-02-04 04:52:56
如果sourceView为null，则只需添加验证
UIActivityViewController * avc = [[UIActivityViewController alloc] initWithActivityItems:shareItems applicationActivities:nil];
if(avc.popoverPresentationController){
avc.popoverPresentationController.sourceView = self.view;
}
[self presentViewController:avc animated:YES completion:nil];https://stackoverflow.com/questions/42920340
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