ios开发之调用相机和本地相册

// 首先来写一些委托 定义一个全局变量
@interface TestViewController : UIViewController<UIActionSheetDelegate,UIImagePickerControllerDelegate>
{
    UIActionSheet *myActionSheet;
}

// 首先创建一个button和一个imageView button点击调出拍照或本地相册上传图片方法, imageView负责显示图片 , 把他们都加入到view中
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);
    button.backgroundColor = [UIColor redColor];
    
    [button addTarget:self action:@selector(openMenu) forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:button];
    
    self.img = [[UIImageView alloc] initWithFrame:
                               CGRectMake(0, 220, self.view.frame.size.width, self.view.frame.size.height)]; // 这个imageView我设置的比较大了一点 - -
    self.img.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:_img];

-(void)openMenu
{
    //这里面用的是ActionSheet
    myActionSheet = [[UIActionSheet alloc]
                 initWithTitle:nil  
                 delegate:self
                 cancelButtonTitle:@"取消"   
                 destructiveButtonTitle:nil
                 otherButtonTitles: @"打开相机", @"从相册获取",nil];
    
    [myActionSheet showInView:self.view];  

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
    
    
    //呼出的菜单按钮点击后的响应
    if (buttonIndex == myActionSheet.cancelButtonIndex) 
    { 
        NSLog(@"取消");
    }
    
    switch (buttonIndex) 
    { 
        case 0:  //打开照相机拍照
            [self takePhoto];
            break; 
      
        case 1:  //打开本地相册
            [self LocalPhoto];
            break; 
    } 
}


//开始拍照
-(void)takePhoto
{
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera; 
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) 
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
        picker.delegate = self; 
        //设置拍照后的图片可被编辑
        picker.allowsEditing = YES; 
        picker.sourceType = sourceType; 
        [self presentModalViewController:picker animated:YES];
    }else
    {
        NSLog(@"模拟其中无法打开照相机,请在真机中使用");
    }  
}

//打开本地相册
-(void)LocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    //设置选择后的图片可被编辑
    picker.allowsEditing = YES;
    [self presentModalViewController:picker animated:YES];
}

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{
    
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    
    //当选择的类型是图片
    if ([type isEqualToString:@"public.image"])
    {
        //先把图片转成NSData
        UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        NSData *data;
        if (UIImagePNGRepresentation(image) == nil) 
        {
            data = UIImageJPEGRepresentation(image, 1.0);
        }
        else 
        {
            data = UIImagePNGRepresentation(image);
        }
        
     
        //图片保存的路径
        //这里将图片放在沙盒的documents文件夹中
        NSString * DocumentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];  
        
        
        //文件管理器
        NSFileManager *fileManager = [NSFileManager defaultManager];
        
        //把刚刚图片转换的data对象拷贝至沙盒中 并保存为image.png
        [fileManager createDirectoryAtPath:DocumentsPath withIntermediateDirectories:YES attributes:nil error:nil];
        
        [fileManager createFileAtPath:[DocumentsPath stringByAppendingString:@"/image.png"] contents:data attributes:nil];
        //关闭相册界面
        [picker dismissModalViewControllerAnimated:YES];
        
        _img.image = image;
        
        
    } 
    
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"您取消了选择图片");
    [picker dismissModalViewControllerAnimated:YES];
}