如何以编程方式创建的uibutton以编程方式显示弹出窗口(不使用接口构建器)

Question

我有一个我在视图控制器中以编程方式创建的按钮.按下按钮后,我希望它使用一种方法以编程方式创建弹出框.

在我的视图controller.m中的ViewDidLoad中创建的按钮

 UIView *moreFundInfoView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 540, 620)];
[self.view addSubview:moreFundInfoView];
[moreFundInfoView setBackgroundColor:[UIColor RMBColor:@"b"]];

btnContact = [UIButton buttonWithType:(UIButtonTypeRoundedRect)];


[btnContact setFrame:CGRectMake(390, 575, contactButton.width, contactButton.height)];
 btnContact.hidden = NO;
[btnContact setTitle:@"Contact" forState:(UIControlStateNormal)];
[moreFundInfoView addSubview:btnContact];

[btnContact addTarget:self action:@selector(showContactDetails:) forControlEvents:UIControlEventTouchUpInside];

然后我按下按钮时使用的方法.

-(void) showContactDetails: (id) sender
{
UIViewController *popoverContent = [[UIViewController alloc]init];

UIView *popoverView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 300)];

[popoverView setBackgroundColor:[UIColor RMBColor:@"b"]];

popoverContent.view = popoverView;

popoverContent.contentSizeForViewInPopover = CGSizeMake(200, 300);

UIPopoverController *contactPopover =[[UIPopoverController alloc] initWithContentViewController:popoverContent];

[contactPopover presentPopoverFromRect:btnContact.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES ];

[contactPopover setDelegate:self];

}

我在这里错过了什么？因为它运行正常,但只要我点击按钮,应用程序崩溃.我认为这是代表问题,但我不确定.任何意见,将不胜感激.

Answer 1

我认为这段代码会对你有所帮助.你当然缺少委托方法

ViewController *viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:navigationController];
popover.delegate = self;
popover.popoverContentSize = CGSizeMake(644, 425); //your custom size.
[popover presentPopoverFromRect:button.frame inView:self.view permittedArrowDirections: UIPopoverArrowDirectionLeft | UIPopoverArrowDirectionUp animated:YES];

只要确保你没有忘记UIPopover Delegate方法,否则应用程序肯定会崩溃.这是强制性的.

Answer 2

我所要做的就是将 .h 文件中的属性从“retain”更改为“strong”，它就可以工作，阻止应用程序崩溃。