iOS中调用系统相册以及使用系统相册的照片

#import "ViewController.h"

@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>
@property (nonatomic,strong)UIImageView *headImageView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.headImageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    _headImageView.backgroundColor = [UIColor yellowColor];
    _headImageView.layer.cornerRadius = 50;
    _headImageView.layer.masksToBounds = YES;
    _headImageView.tag = 101;
    [self.view addSubview:_headImageView];
    
    _headImageView.userInteractionEnabled = YES;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
    [_headImageView addGestureRecognizer:tap];
    
    
    
    
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)tapAction:(UIImageView*)sender
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];
    imagePicker.allowsEditing = YES;
    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    imagePicker.delegate = self;
    [self presentViewController:imagePicker animated:YES completion:^{
        NSLog(@"打开相册");
    }];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:^{
        NSLog(@"取消");
    }];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    _headImageView.image = info[UIImagePickerControllerEditedImage];
    NSLog(@"%@",info);
    [picker dismissViewControllerAnimated:YES completion:^{
        NSLog(@"选照片");
    }];
    
    
    
}

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

@end