iOS 8.3 中的 UIDatePicker 内存泄漏

当在运行 IOS 8.3 的 iPad 上的弹出窗口中使用 UIDatePicker 时，我发现内存泄漏。每次弹出日期选择器然后关闭时，我都会在多次内存泄漏中得到大约 5K 的信息。泄漏的对象是 NSDateComponents，负责的框架是 [_UIDatePickerMode _yearlessYearForMonth:]。

我编写了一个简单的测试应用程序来演示该问题（https://github.com/david-ape/datepickertest/）。我已经包含了 UIPopoverController 选项和 UIPopoverPresentationController 选项，但使用哪个选项似乎并不重要。

我是否做错了什么，或者有解决方法，还是需要等待 Apple 的修复？如果是后者，那么有人可以建议我可以使用第三方控件来代替 UIDatePicker 吗？

下面是我用来弹出日期选择器的代码。

头文件

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIPopoverControllerDelegate,
                                              UIPopoverPresentationControllerDelegate>


@end

实施文件

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIPopoverController *ios7Popover;

- (IBAction)datePickerPopupIOS7:(UIButton *)sender;
- (IBAction)datePickerPopupIOS8:(UIButton *)sender;

@end

@implementation ViewController

// helper - returns a view controller containing a date picker for use in a
// popup
+ (UIViewController *)buildDatePickerViewController
{
    CGRect frame = CGRectMake(0, 0, 350, 216);

    UIViewController *viewController = [[UIViewController alloc]init];
    viewController.preferredContentSize = frame.size;
    UIDatePicker *datepicker = [[UIDatePicker alloc]initWithFrame:frame];
    datepicker.datePickerMode = UIDatePickerModeDate;
    datepicker.hidden = NO;
    datepicker.date = [NSDate date];
    [viewController.view addSubview:datepicker];
    return viewController;
}

// popup date picker using UIPopoverController (IOS7 compatible)
- (IBAction)datePickerPopupIOS7:(UIButton *)sender
{
    UIViewController *viewController = [ViewController buildDatePickerViewController];

    self.ios7Popover = [[UIPopoverController alloc]initWithContentViewController:viewController];
    self.ios7Popover.delegate = self;
    [self.ios7Popover presentPopoverFromRect:sender.frame
                                      inView:self.view
                    permittedArrowDirections:(UIPopoverArrowDirectionUp|UIPopoverArrowDirectionDown| UIPopoverArrowDirectionLeft|UIPopoverArrowDirectionRight)
                                    animated:YES];
}

// popup date picker using UIPopoverPresentationController (IOS8 or later required)
// Thanks to http://stackoverflow.com/a/26944036/1764243 for how to do this
- (IBAction)datePickerPopupIOS8:(UIButton *)sender
{
    if ([UIPopoverPresentationController class])
    {
        UIViewController *viewController = [ViewController buildDatePickerViewController];

        UINavigationController *destNav = [[UINavigationController alloc] initWithRootViewController:viewController];
        destNav.modalPresentationStyle = UIModalPresentationPopover;
        UIPopoverPresentationController *popover = destNav.popoverPresentationController;
        popover.delegate = self;
        popover.sourceView = self.view;
        popover.sourceRect = [sender frame];
        destNav.navigationBarHidden = YES;
        [self presentViewController:destNav animated:YES completion:nil];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Not supported"
                                                        message:@"UIPopoverPresentationController not supported in this version of IOS"
                                                       delegate:nil
                                              cancelButtonTitle:@"Ok"
                                              otherButtonTitles:nil];
        [alert show];
    }
}

#pragma mark - UIPopoverControllerDelegate methods

 - (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
    self.ios7Popover = nil;
}

@end