storyboard.png

import <MobileCoreServices/MobileCoreServices.h>

import "ViewController.h"

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
{
UIImagePickerController * _imagePickerController;
}
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
  btn.backgroundColor = [UIColor purpleColor];
  [btn addTarget:self action:@selector(gotoPhoto) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:btn];
  // Do any additional setup after loading the view, typically from a nib.
  }

• (void)gotoPhoto
  {
  NSLog(@"photo");
  self.imageView.backgroundColor = [UIColor yellowColor];
  [self setupImagePickerController];
  }

/*创建对象/

• (void)setupImagePickerController
  {
  //第一步:判断摄像头是否打开
  if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
  {
  //第二步:实例化UIImagePickerController对象
  _imagePickerController = [[UIImagePickerController alloc] init];
  //第三步:告诉picker对象是获取相机资源
  _imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
  //第四步:设置代理
  _imagePickerController.delegate = self;
  //第五步:设置picker可以编辑
  _imagePickerController.allowsEditing = YES;
  //第六步:设置进去的模态方式
  _imagePickerController.modalPresentationStyle=UIModalPresentationOverCurrentContext;
  //第七步:跳转
  [self presentViewController:_imagePickerController animated:YES completion:nil];
  }
  }

pragma mark --代理方法UIImagePickerControllerDelegate--

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
  {
  //获取选中资源的类型
  NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
  //只能拍照(还有摄像或者二者都可以有的)
  NSString *requiredMediaType = (NSString *)kUTTypeImage;
  if([mediaType isEqualToString:requiredMediaType])
  {
  UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
  self.imageView.image = image;
  }
  [picker dismissViewControllerAnimated:YES completion:nil];
  }

pragma mark --取消选择图片

• (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
  {
  [picker dismissViewControllerAnimated:YES completion:nil];
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }
  @end