我对Objective-C很新，我想创建一个应用程序，最终用相机拍照，但图像覆盖。但我想我会从一个简单的相机应用程序开始，只是为了获得它的基础。我已经按照教程创建了一个可以拍照并访问图像库的应用程序。但是当我将它构建到我的iPhone 4s时，它只会加载一个白色屏幕。如果有人可以看看代码，但我认为它是正确的，并提供答案，非常感谢。
//ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
- (IBAction)takePhoto:(UIButton *)sender;
- (IBAction)selectPhoto:(UIButton *)sender;
@end
// ViewController.m
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
message:@"Device has no camera"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[myAlertView show];
}
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
- (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];
}
- (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];
}
#pragma mark - Image Picker Controller delegate methods
- (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];
}
@end