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