iOS從手機相冊選擇一張照片並顯示 Objective-C

 

要先給app設置訪問相冊的權限：

在項目的Info.plist文件里添加Privacy - Photo Library Usage Description權限

 

ViewController.h：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UIImageView *myImageView; //與ImageView視圖關聯
}


- (IBAction)buttonUp:(id)sender;  // 與一個Button關聯

@end

 

ViewController.m：

#import "ViewController.h"


@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>//接口

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}


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


- (IBAction)buttonUp:(id)sender {
    //初始化UIImagePickerController類
    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    //判斷數據來源為相冊
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    //設置代理
    picker.delegate = self;
    //打開相冊
    [self presentViewController:picker animated:YES completion:nil];
}

//選擇完成回調函數
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    //獲取圖片
    UIImage *image = info[UIImagePickerControllerOriginalImage];
    [self dismissViewControllerAnimated:YES completion:nil];

    myImageView.image = image;
}

//用戶取消選擇
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [self dismissViewControllerAnimated:YES completion:nil];
}


@end