iphone开发之UIImagePickerController组件的预习————用于照相和打开图库

末蓝、 2022-08-04 15:00 136阅读 0赞

新建工程  编辑控制器的.h文件如下：

//
    //  ViewController.h
    //  多媒体A
    //
    //  Created by apple on 15/9/4.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import <UIKit/UIKit.h>
    
    @interface ViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIActionSheetDelegate>
    
    @property(nonatomic, strong) UIImageView *cameraImageView;
    
    @end

编辑控制器的.m文件如下：

//
    //  ViewController.m
    //  多媒体A
    //
    //  Created by apple on 15/9/4.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        [self  initCameraBtnAndCaneraImageView];
    }
    -(void)addPhoto
    {
       // 相册可以用模拟器打开，但是相机不可以用模拟器打开
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
        {
            NSLog(@"addPhoto");
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.allowsEditing = YES; // 是否可以编辑
            
            // 打开相册选择相片
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  //表示管理图库
            
            [self presentViewController:picker animated:YES completion:^{ }];
        }
        else
        {
            [self showAlertView];
        }
    }
    
    -(void)showActionSheet
    {
        UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"我的相册", nil];
        [actionSheet showInView:self.view];
    
    }
    
    // 实现UIActionSheetDelegate协议中监听按钮的方法
    -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        if (buttonIndex == 0) {
            [self addCamera];
        }
        else if(buttonIndex == 1)
        {
            [self  addPhoto];
        
        }
    
    }
    
    -(void) initCameraBtnAndCaneraImageView
    {
       // 代码实现自定义按钮
        UIButton *cameraBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        cameraBtn.frame = CGRectMake(120, 150, 80, 120);
        
        // 设置按钮的响应事件
        [cameraBtn addTarget:self action:@selector(showActionSheet) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:cameraBtn];
        
        // 设置图片显示框
        self.cameraImageView = [[UIImageView alloc] initWithFrame:CGRectMake(120, 150, 80, 120)];
        self.cameraImageView.backgroundColor = [UIColor blueColor];
        [self.view addSubview:self.cameraImageView];
    
    }
    
    //打开相机
    -(void)addCamera
    {
        // 判断是否可以打开相机，模拟器的此功能无法使用
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            
            // 创建一个调出拍照的控制器
            UIImagePickerController *picker = [[UIImagePickerController alloc ] init];
            picker.delegate = self;
            picker.allowsEditing = YES;
            // 摄像头
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            
            [self  presentViewController:picker animated:YES completion:^{ }];
            
        }
        else
        {
            [self showAlertView];
            
        }
        
    }
    
    // 拍摄完成后要执行的方法
    -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
    {
         // 得到图片
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
        
        // 图片存入相册
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
        self.cameraImageView.image = image;
        [self dismissViewControllerAnimated:YES completion:nil];
        
    }
    
    // 点击cancel按钮后执行的方法
    -(void) imagePickerControllerDidCancel:(UIImagePickerController *)picker
    {
        [self dismissViewControllerAnimated:YES completion:nil];
    
    }
    
    
    -(void)showAlertView
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你没有摄像头" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
       
    }
    
    
    @end

运行结果如下：

![Center][]  
![Center 1][]

[Center]: /images/20220731/2f71920d23dd4c59a53b2f3c7e9ce3c3.png
[Center 1]: /images/20220731/307632338ed74856ad36708abb495cf1.png