Question

我只是希望用户在应用程序中拍照→裁剪→保存。所以我想使用UIImagePickerControl的allowsEditing属性。但是我不知道我怎么做。这是我的代码，直到现在为相机。

-(IBAction)TakePhoto {
    picker = [[UIImagePickerController alloc]init];
    picker.delegate = self;
    [picker setSourceType:UIImagePickerControllerSourceTypeCamera];
    [self presentViewController:picker animated:YES completion:NULL];

}

Answer 1

用于从相机中挑选照片

- (IBAction)takePhoto:(UIButton *)sender {

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;

[self presentViewController:picker animated:YES completion:NULL];   
}

使用此功能从照片库中挑选照片

- (IBAction)selectPhoto:(UIButton *)sender {

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

[self presentViewController:picker animated:YES completion:NULL];

}

使用以下两种委托方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
self.imageView.image = chosenImage;

[picker dismissViewControllerAnimated:YES completion:NULL];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

[picker dismissViewControllerAnimated:YES completion:NULL];

}

在ViewDidLoad方法中添加此项，因此如果您的设备不支持相机，则显示此警报消息。

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

    UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                    message:@"Device has no camera"
                                                    delegate:nil
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles: nil];

    [myAlertView show];

}

将两个协议添加到AppViewController.h文件中：

@interface APPViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

如何使用allowsEditing

1 个答案: