objective-c UIImagePickerController 相冊視圖控制器

//

//  ViewController.m

//  相冊

//

//  Created by DC017 on 16/1/5.

//  Copyright © 2016年 DC017. All rights reserved.

//

#import "ViewController.h"

//要遵照兩個協議UINavigationControllerDelegate，UIImagePickerControllerDelegate

@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

{

    UIImagePickerController * imagePickerControll;//系統照片選擇控制器

    UIImageView * imageView;//用來顯示選擇的圖片

    

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    [self layout];

    

}

- (IBAction)open:(id)sender {

    //模態跳轉（通常用於視圖控制器---Controller）

    [self presentViewController:imagePickerControll animated:YES completion:nil];

}

-(void)layout{

    //初始化選擇器

    imagePickerControll=[[UIImagePickerController alloc]init];

    imagePickerControll.delegate=self;

    imageView=[[UIImageView alloc]initWithFrame:CGRectMake(40, 100, 200, 200)];

    

    imageView.contentMode=UIViewContentModeScaleAspectFit;

    [self.view addSubview:imageView];

}

//協議裏的方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    //從哪裏來到哪裏去（跳轉）

    [self dismissViewControllerAnimated:YES completion:nil];

    //將相冊裏的照片顯示在界面上

    UIImage * image=[info objectForKey:UIImagePickerControllerOriginalImage];

    imageView.image=image;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end