本篇IOS应用开发教程将为大家讲解iOS从手机相册选择一张照片并显示 Objective-C，看完这篇文章会让你对IOS编程的知识点有更加清晰的理解和运用。

要先给app设置访问相册的权限：

在项目的Info.plist文件里添加Privacy - Photo Library Usage Description权限

ViewController.h：

 1 #import <UIKit/UIKit.h> 2  3 @interface ViewController : UIViewController 4 { 5     IBOutlet UIImageView *myImageView; //与ImageView视图关联 6 } 7  8  9 - (IBAction)buttonUp:(id)sender;  // 与一个Button关联10 11 @end

ViewController.m：

 1 #import "ViewController.h" 2  3  4 @interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>//接口 5  6 @end 7  8 @implementation ViewController 9 10 - (void)viewDidLoad {11     [super viewDidLoad];12     // Do any additional setup after loading the view, typically from a nib.13 }14 15 16 - (void)didReceiveMemoryWarning {17     [super didReceiveMemoryWarning];18     // Dispose of any resources that can be recreated.19 }20 21 22 - (IBAction)buttonUp:(id)sender {23     //初始化UIImagePickerController类24     UIImagePickerController * picker = [[UIImagePickerController alloc] init];25     //判断数据来源为相册26     picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;27     //设置代理28     picker.delegate = self;29     //打开相册30     [self presentViewController:picker animated:YES completion:nil];31 }32 33 //选择完成回调函数34 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{35     //获取图片36     UIImage *image = info[UIImagePickerControllerOriginalImage];37     [self dismissViewControllerAnimated:YES completion:nil];38 39     myImageView.image = image;40 }41 42 //用户取消选择43 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{44     [self dismissViewControllerAnimated:YES completion:nil];45 }46 47 48 @end

希望这篇文章可以帮助到你。总之，同学们，你想要的职坐标IOS频道都能找到!