IOS开发之小实例--UIImagePickerController

 1 #import "ViewController.h"
 2 
 3 @interface ViewController () <UIImagePickerControllerDelegate,UINavigationControllerDelegate>
 4 
 5 @property (strong, nonatomic) IBOutlet UIImageView *imageView;
 6 
 7 @end
 8 
 9 @implementation ViewController
10 
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     
14     // 这段代码会自动判断当前设备是否有摄像机功能，如果没有，会弹窗提示
15     if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
16         
17         UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
18                                                               message:@"Device has no camera"
19                                                              delegate:nil
20                                                     cancelButtonTitle:@"OK"
21                                                     otherButtonTitles: nil];
22         
23         [myAlertView show];
24         
25     }
26 }
27 - (IBAction)takePhotot:(UIButton *)sender {
28     // 创建UIImagePickerController控制器对象
29     UIImagePickerController *picker = [[UIImagePickerController alloc] init];
30     picker.delegate = self;
31     picker.allowsEditing = YES;
32     picker.sourceType = UIImagePickerControllerSourceTypeCamera;
33     
34     [self presentViewController:picker animated:YES completion:nil];
35 }
36 - (IBAction)selectPhoto:(UIButton *)sender {
37     // 创建UIImagePickerController控制器对象
38     UIImagePickerController *picker = [[UIImagePickerController alloc] init];
39     picker.delegate = self;
40     picker.allowsEditing = YES;
41     picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
42     
43     [self presentViewController:picker animated:YES completion:nil];
44 }
45 #pragma mark - 代理方法
46 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
47     UIImage* chosenImage = info[UIImagePickerControllerEditedImage];
48     self.imageView.image = chosenImage;
49     
50     [picker dismissViewControllerAnimated:YES completion:nil];
51 }
52 -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
53     [picker dismissViewControllerAnimated:YES completion:nil];
54 }
55 
56 @end