调用手机相册

设置info

ap.h里面

//
//  AppDelegate.h
//  JHH-调用相机相册
//
//  Created by 贾欢 on 2018/5/24.
//  Copyright © 2018年 jiahuan. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (readonly, strong) NSPersistentContainer *persistentContainer;

- (void)saveContext;


@end

vc里面

//
//  ViewController.m
//  JHH-调用相机相册
//
//  Created by 贾欢 on 2018/5/24.
//  Copyright © 2018年 jiahuan. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
@property(nonatomic,strong) UIImageView * imageView;
@property(nonatomic,strong) UIButton * selectBtn;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //头像
    _imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, self.view.frame.size.width - 200, self.view.frame.size.width - 200)];
    _imageView.backgroundColor = [UIColor lightGrayColor];
    _imageView.layer.cornerRadius =(self.view.frame.size.width - 200)/2;
    _imageView.layer.masksToBounds = YES;
    [self.view addSubview:_imageView];
    
    //按钮
    _selectBtn = [[UIButton alloc]initWithFrame:CGRectMake(150, 400, self.view.frame.size.width - 300, 50)];
    [_selectBtn setTitle:@"点击选择照片" forState:UIControlStateNormal];
    [_selectBtn setBackgroundColor:[UIColor redColor]];
    [_selectBtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_selectBtn];
   
    
}
-(void)btnClick:(UIButton *)btn{
    // 创建UIImagePickerController实例
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    // 设置代理
    imagePickerController.delegate = self;
    // 是否允许编辑（默认为NO）
    imagePickerController.allowsEditing = YES;
    // 创建一个警告控制器
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"选取图片" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    // 设置警告响应事件
    UIAlertAction *cameraAction = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        // 设置照片来源为相机
        imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
        // 设置进入相机时使用前置或后置摄像头
        imagePickerController.cameraDevice = UIImagePickerControllerCameraDeviceFront;
        // 展示选取照片控制器
        [self presentViewController:imagePickerController animated:YES completion:^{}];
    }];
    UIAlertAction *photosAction = [UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentViewController:imagePickerController animated:YES completion:^{}];
    }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    }];
    // 判断是否支持相机
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        // 添加警告按钮
        [alert addAction:cameraAction];
    }
    [alert addAction:photosAction];
    [alert addAction:cancelAction];
    // 展示警告控制器
    [self presentViewController:alert animated:YES completion:nil];
}
//设置UIImagePickerController的代理方法：
#pragma mark - UIImagePickerControllerDelegate
// 完成图片的选取后调用的方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    // 选取完图片后跳转回原控制器
    [picker dismissViewControllerAnimated:YES completion:nil];
    /* 此处参数 info 是一个字典，下面是字典中的键值 （从相机获取的图片和相册获取的图片时，两者的info值不尽相同）
     * UIImagePickerControllerMediaType; // 媒体类型
     * UIImagePickerControllerOriginalImage; // 原始图片
     * UIImagePickerControllerEditedImage; // 裁剪后图片
     * UIImagePickerControllerCropRect; // 图片裁剪区域（CGRect）
     * UIImagePickerControllerMediaURL; // 媒体的URL
     * UIImagePickerControllerReferenceURL // 原件的URL
     * UIImagePickerControllerMediaMetadata // 当数据来源是相机时，此值才有效
     */
    // 从info中将图片取出，并加载到imageView当中
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    self.imageView.image = image;
    // 创建保存图像时需要传入的选择器对象（回调方法格式固定）
    SEL selectorToCall = @selector(image:didFinishSavingWithError:contextInfo:);
    // 将图像保存到相册（第三个参数需要传入上面格式的选择器对象）
    UIImageWriteToSavedPhotosAlbum(image, self, selectorToCall, NULL);
}
// 取消选取调用的方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:YES completion:nil];
}
//添加保存图片完成后的回调方法：
// 保存图片后到相册后，回调的相关方法，查看是否保存成功
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error == nil){
        NSLog(@"Image was saved successfully.");
    } else {
        NSLog(@"An error happened while saving the image.");
        NSLog(@"Error = %@", error);
    }
}

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


@end