UIImagePicker在ios7/iphone 4s上崩溃了

Question

我有一个使用UIImagePickerController的应用程序,允许用户拍照.

我已将测试用例缩减为单个视图控制器应用程序中最简单的序列.这是我的代码.

//
//  CTViewController.h
//  Camera Test
//

#import <UIKit/UIKit.h>

@interface CTViewController : UIViewController <UINavigationControllerDelegate,   UIImagePickerControllerDelegate>

@property (nonatomic, retain) UIImagePickerController *cameraController;

- (IBAction)takePicture:(id)sender;

@end

代码的主体如下:

//
//  CTViewController.m
//  Camera Test

#import "CTViewController.h"

....

- (void)didReceiveMemoryWarning
{
    NSLog(@"%s", __func__);

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)takePicture:(id)sender
{
    self.cameraController = [[UIImagePickerController alloc] init];

    self.cameraController.sourceType = UIImagePickerControllerSourceTypeCamera;
    self.cameraController.allowsEditing = YES;
    self.cameraController.delegate = self;
    [self presentViewController:self.cameraController animated:YES completion:nil];
}

'takePicture'连接到我可以在屏幕中间按下的按钮.

在ios 6上,一切都运行良好,但是在ios 7上,一旦显示了viewcontroller,我就会得到一连串的内存警告.从而:

Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
Received memory warning.
-[CTViewController didReceiveMemoryWarning]

.... <here I take a picture, which I do nothing with>

Received memory warning.
-[CTViewController didReceiveMemoryWarning]
Received memory warning.
-[CTViewController didReceiveMemoryWarning]

.... <I get a cascade of these warnings>

该应用程序是使用ios 7.0 sdk使用xcode 5构建的.如果我使用ios 6.1 sdk构建,但在ios7上运行,则会出现同样的问题.使用ios 6.1 sdk构建并在ios 6.1.3上运行不会导致消息,也不会产生任何问题.

我的完整应用程序在ios 7上有50%的时间崩溃.我通过抛出大量内容(图像大部分)来回应内存警告,并且分析确认了这一点,但我仍然得到了级联警告(即它们继续之后释放内存).

如果我使用前置摄像头,从图库中选择或使用iPad 3,则没有消息.因此,我怀疑使用后置摄像头时内存问题与UIImagePickerController的大小有关.

我已经完全探索了stackoverflow并特别关注这篇文章--UIImagePickerController错误:在iOS 7中快照未渲染的视图会导致空快照

我已经尝试了所有建议,但我的简单测试应用程序排除了大多数解释.

有什么想法吗？我应该放弃对iPhone 4S的支持吗？我还没有确认iPhone 5上的问题,但我会尽快更新这个问题.

:-)

Answer 1

我建议您不要使用图像选择器的属性，而是使用本地对象。请参阅下面我的代码，该代码在 IOS7 上也运行良好。

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.showsCameraControls = YES;

    [self presentViewController:imagePicker animated:YES completion:nil];
}