基于OC的相册访问问题

相册访问

访问相册需要在info.plist 配置一个权限

    NSPhotoLibraryUsageDescription

////  获取相册权限.m//  OC知识点整理////  Created by li on 17/2/26.//  Copyright © 2017年 李文强. All rights reserved.//#import "获取相册权限.h"@interface ______ ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>@property (nonatomic, strong)UIImageView *myHeadPortrait;@end@implementation ______/*        访问相册需要在info.plist 配置一个权限        NSPhotoLibraryUsageDescription */- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    self.myHeadPortrait = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];    _myHeadPortrait.backgroundColor = [UIColor magentaColor];    [self.view addSubview:self.myHeadPortrait];    [self setHeadPortrait];}#pragma mark 设置头像样式-(void)setHeadPortrait{    //  把头像设置成圆形    self.myHeadPortrait.layer.cornerRadius=self.myHeadPortrait.frame.size.width/2;    self.myHeadPortrait.layer.masksToBounds=YES;    //  给头像加一个圆形边框    self.myHeadPortrait.layer.borderWidth = 1.5f;    self.myHeadPortrait.layer.borderColor = [UIColor blackColor].CGColor;    /**     *  添加手势：也就是当用户点击头像了之后，对这个操作进行反应     */    //允许用户交互    _myHeadPortrait.userInteractionEnabled = YES;    //初始化一个手势    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]initWithTarget:self                                                                               action:@selector(alterHeadPortrait:)];    //给imageView添加手势    [_myHeadPortrait addGestureRecognizer:singleTap];}#pragma mark 添加提示框，并设置点击事件-(void)alterHeadPortrait:(UITapGestureRecognizer *)gesture{    /**     *  弹出提示框     */    //初始化提示框    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];    //按钮：从相册选择，类型：UIAlertActionStyleDefault    [alert addAction:[UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        //初始化UIImagePickerController        UIImagePickerController *PickerImage = [[UIImagePickerController alloc]init];        //获取方式1：通过相册（呈现全部相册），UIImagePickerControllerSourceTypePhotoLibrary        //获取方式2，通过相机，UIImagePickerControllerSourceTypeCamera        //获取方法3，通过相册（呈现全部图片），UIImagePickerControllerSourceTypeSavedPhotosAlbum        PickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;        //允许编辑，即放大裁剪        PickerImage.allowsEditing = YES;        //自代理        PickerImage.delegate = self;        //页面跳转        [self presentViewController:PickerImage animated:YES completion:nil];    }]];    //按钮：拍照，类型：UIAlertActionStyleDefault    [alert addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action){        /**         其实和从相册选择一样，只是获取方式不同，前面是通过相册，而现在，我们要通过相机的方式         */        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]){            UIImagePickerController *PickerImage = [[UIImagePickerController alloc]init];            //获取方式:通过相机            PickerImage.sourceType = UIImagePickerControllerSourceTypeCamera;            PickerImage.allowsEditing = YES;            PickerImage.delegate = self;            [self presentViewController:PickerImage animated:YES completion:nil];        }    }]];    //按钮：取消，类型：UIAlertActionStyleCancel    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];    [self presentViewController:alert animated:YES completion:nil];}#pragma mark 设置代理方法，对获取的图片进行处理- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{    //定义一个newPhoto，用来存放我们选择的图片。    UIImage *newPhoto = [info objectForKey:@"UIImagePickerControllerEditedImage"];    _myHeadPortrait.image = newPhoto;    [self dismissViewControllerAnimated:YES completion:nil];}｝