Question

我正在尝试使用UIImagePickerController从iPhone / iPad上的用户照片中抓取照片。这段代码适用于iPhone，但是当我在iPad上运行时，调试器给我的消息是“由于未捕获的异常终止应用程序'NSGenericException'，原因：' - [UIPopoverController dealloc]到达，而popover仍然可见。”我对Objective-C很新，所以我不确定是什么造成这种情况，我没有解除任何问题，我已经开启了ARC。这是我的代码： ViewController.m

#import "PhotoViewController.h"


@implementation PhotoViewController
@synthesize grabButton;
@synthesize image;
@synthesize imgPicker;

- (IBAction)grabImage {
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
        UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:imgPicker];
        [popover presentPopoverFromRect:self.image.bounds inView:self.image permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    } else {
        [self presentModalViewController:imgPicker animated:YES];
    }
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editInfo {
    image.image = img;
    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
}

- (void)viewDidLoad
{
    self.imgPicker = [[UIImagePickerController alloc] init];
    self.imgPicker.allowsImageEditing = YES;
    self.imgPicker.delegate = self;
    self.imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

}

Answer 1

UIPopover是一个丑陋的物体拼凑的野兽。它必须是强大的属性和iVar才能确保不会过早地达到Dealloc。在.h中添加此内容：

@interface MyClass: NSObject {
    UIPopover *_popover;
}
@property (nonatomic, strong) UIPopover * popover;

//.m 

@synthesize popover = _popover;

实例化弹出窗口时，将其分配给属性或实例：

self.popover = [[UIPopoverController alloc] initWithContentViewController:imgPicker];

或

_popover = [[UIPopoverController alloc] initWithContentViewController:imgPicker];

UIPopoverController的奇怪错误

1 个答案: