系统相冊和拍照

1.系统相冊和拍照

//有系统预置的多媒体參数
#import <MobileCoreServices/MobileCoreServices.h>

UIImagePickerController 拍照和获取系统相冊
推断是否支持
BOOL ret = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    //设置资源类型
    imagePicker.sourceType = type;
    //设置代理
    imagePicker.delegate = self;
    //是否同意对相冊 等做兴许处理
    imagePicker.allowsEditing = YES;
    [self presentViewController:imagePicker animated:YES completion:^{
        
    }];


#pragma mark - UIImagePickerControllerDelegate
//点击picker上的cancelbutton时，触发的方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    NSLog(@"cancel!!");
    //实现picker的dismiss
    [picker dismissViewControllerAnimated:YES completion:^{
    }];
}


//点击choosebutton触发的方法
//info 带有选中资源的信息
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    //推断选中的资源的类型
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    //kUTTypeImage 系统预置的图片资源类型
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        //证明取出来的是图片
        //通过字典获取选中的图片
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
        //从相机中取出来的图片占的空间:(1M-2M)左右,须要对图片进行压缩处理,然后在进行兴许操作
        //将原图压缩成50*50的尺寸
        UIImage *smallImage = [[ImageTool shareTool] resizeImageToSize:CGSizeMake(50,50) sizeOfImage:image];
        self.view.backgroundColor = [UIColor colorWithPatternImage:smallImage];
    }
    [picker dismissViewControllerAnimated:YES completion:^{
    }];
}