我在 iOS 7 设备上显示 UIImagePickerController 时遇到问题。我使用以下代码来呈现图像选择器。
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraUI.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
cameraUI.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
cameraUI.delegate = self;
[[self presentViewController:cameraUI animated:YES completion:NULL];
调用 presentViewController 后,应用程序因 exec 错误访问而崩溃。控制台报如下异常。
[SBSAccelerometer valueRestriction]: unrecognized selector sent to instance 0x1650e360
[__NSCFNumber valueRestriction]: unrecognized selector sent to instance 0x146d0e70
我启用了僵尸程序来查看对象是否过早释放。 Zombies 报告以下异常:
[NSISRestrictedToNonNegativeVariable retain]: message sent to deallocated instance 0x156f0010
有什么想法吗?
编辑
这是我在启用僵尸的情况下收到的堆栈跟踪:
最佳答案
这是 iPad 上 iOS 7 中的一个错误。看来现在的解决方案是在打开 UIPopoverControl 之前请求对照片的许可。以下是我如何实现我的解决方案:
**// Photo Library
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
void(^blk)() = ^() {
UIImagePickerController* picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
if (NIIsPad()) {
UIPopoverController* popover = [[UIPopoverController alloc] initWithContentViewController:picker];
[popover presentPopoverFromBarButtonItem:self.popoverAnchor permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
} else {
[self.navigationController presentModalViewController:picker animated:YES];
}
};
// Make sure we have permission, otherwise request it first
ALAssetsLibrary* assetsLibrary = [[ALAssetsLibrary alloc] init];
ALAuthorizationStatus authStatus;
if (IOS_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0"))
authStatus = [ALAssetsLibrary authorizationStatus];
else
authStatus = ALAuthorizationStatusAuthorized;
if (authStatus == ALAuthorizationStatusAuthorized) {
blk();
} else if (authStatus == ALAuthorizationStatusDenied || authStatus == ALAuthorizationStatusRestricted) {
[[UIAlertView alertViewWithTitle:@"Grant photos permission" message:@"Grant permission to your photos. Go to Settings App > Privacy > Photos."] show];
} else if (authStatus == ALAuthorizationStatusNotDetermined) {
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
// Catch the final iteration, ignore the rest
if (group == nil)
dispatch_async(dispatch_get_main_queue(), ^{
blk();
});
*stop = YES;
} failureBlock:^(NSError *error) {
// failure :(
dispatch_async(dispatch_get_main_queue(), ^{
[[UIAlertView alertViewWithTitle:@"Grant photos permission" message:@"Grant permission to your photos. Go to Settings App > Privacy > Photos."] show];
});
}];
}
}**
不要忘记将 AssetsLibrary.framework 添加到您的项目中。
关于ios - 呈现 UIImagePickerController 会导致 iOS 7 崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19578080/