UIImagePicker崩溃在ios7/iphone 4s

Question

我有一个应用程序，它使用UIImagePickerController来允许用户拍照。

我已经将测试用例简化为单个视图控制器应用程序中最简单的顺序。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”被挂接到一个按钮，我可以在屏幕的中间压。

在ios 6上一切正常，但在ios 7上，一旦viewcontroller出现，我会得到一连串的内存警告。因此：

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> 

的应用程序使用的IOS，如果我建立一个与IOS 6.1的SDK，但ios7运行7.0 SDK使用Xcode的5同样的问题时建造的。使用ios 6.1 sdk构建并在ios 6.1.3上运行不会导致任何消息和问题。

我的完整应用程序在ios 7上崩溃了50％。我通过抛出大量内容（图像大多数）内存不足和分析来回应内存警告，但我仍然得到警告级联（即在内存释放后它们继续）。

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，当使用后置摄像头时，我怀疑内存问题与UIImagePickerController的大小有关。

我有充分的探讨和计算器都显得格外这个帖子 - UIImagePickerController error: Snapshotting a view that has not been rendered results in an empty snapshot in iOS 7

我已经试过各种建议，但我的简单测试应用程序阻止大多数的解释。

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

:-)

Answer 1

我建议你不要使用图片选择器的属性，有一个本地对象，而不是。看下面我的代码，IOS7也很好。

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]; 
}