调用相册

#import "ViewController.h"

@interface ViewController ()<UIImagePickerControllerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.backgroundColor = [UIColor grayColor];
    btn.frame = CGRectMake(20, 30, 80, 80);
    [btn addTarget:self action:@selector(showImagerPicker) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    
}

-(void)showImagerPicker{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];//创建对象
    imagePicker.sourceType = 0;//设置类型(相册、相机）
    
    imagePicker.allowsEditing = YES;//是否允许编辑，默认no，设置为yes时，点击图片会进入编辑界面（裁剪）
    imagePicker.delegate = self;
    [self presentViewController:imagePicker animated:YES completion:nil];//弹出相册/相机
}

//选择图片后调用的代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    NSLog(@"----%@",info);
    
    UIImage *image = info[@"UIImagePickerControllerEditedImage"];//获取图片
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(30, 140, 90, 90);
    [self.view addSubview:imageView];
    
    [self dismissViewControllerAnimated:YES completion:nil];//消失imagepicker
    
}

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

@end