Storing Photos in the Photo Library（储存相片至手机）

1。导入库和协议（protocol）

   #import <MobileCoreServices/MobileCoreServices.h>

    <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

   方法：UIImageWriteToSavePhotosAlbum

e.g.

- (BOOL) cameraSupportsMedia:(NSString *)paramMediaType  sourceType:(UIImagePickerControllerSourceType)paramSourceType{   

   __block BOOL result = NO;  

    if ([paramMediaType length] == 0){

        NSLog(@"Media type is empty.");

        return NO;

    }  
    //获取本机中符合指定资源的所有媒体类型，以便后续判定是否支持

    NSArray *availableMediaTypes = [UIImagePickerController  availableMediaTypesForSourceType:paramSourceType];   

    [availableMediaTypes  enumerateObjectsUsingBlock:

       ^(id obj, NSUInteger idx, BOOL *stop) {         

         NSString *mediaType = (NSString *)obj;

         if ([mediaType isEqualToString:paramMediaType]){

             result = YES;

             *stop= YES;

         }       

     }];  

    return result;   

}    

//是否支持拍照 

- (BOOL) doesCameraSupportTakingPhotos{    
    //kUTTypeImage:静态图片

    return [self cameraSupportsMedia:(__bridge NSString *)kUTTypeImage  sourceType:UIImagePickerControllerSourceTypeCamera];   

}

//是否可用摄像头

- (BOOL) isCameraAvailable{

    return  [UIImagePickerController isSourceTypeAvailable:  UIImagePickerControllerSourceTypeCamera];   

}

//保存后调用

- (void) imageWasSavedSuccessfully:(UIImage *)paramImage  didFinishSavingWithError:(NSError *)paramError  contextInfo:(void *)paramContextInfo{   

    if (paramError == nil){

        NSLog(@"Image was saved successfully.");

    } else {

        NSLog(@"An error happened while saving the image.");

        NSLog(@"Error = %@", paramError);

    }    

}

//delegate:完成选择

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

    NSLog(@"Picker returned successfully.");   

    NSLog(@"info:%@", info);   

    NSString  *mediaType = info[UIImagePickerControllerMediaType];   

    if ([mediaType isEqualToString:(__bridge NSString *)kUTTypeImage]){       

        UIImage *theImage = nil;       

        if ([picker allowsEditing]){

            theImage = info[UIImagePickerControllerEditedImage];

        } else {

            theImage = info[UIImagePickerControllerOriginalImage];

        }       

        SEL selectorToCall =  @selector(imageWasSavedSuccessfully:didFinishSavingWithError:contextInfo:);  

       //保存到相册   

       UIImageWriteToSavedPhotosAlbum(theImage, self, selectorToCall,  NULL);     

    }   

    [picker dismissViewControllerAnimated:YES completion:nil];  

}

//delegate 取消选择

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{   

    NSLog(@"Picker was cancelled");

    [picker  dismissViewControllerAnimated:YES completion:nil];   

}

- (void)actionDisplayPickerController{

    if ([self isCameraAvailable] &&  [self doesCameraSupportTakingPhotos]){      

        UIImagePickerController *controller = [[UIImagePickerController alloc] init];        

        controller.sourceType = UIImagePickerControllerSourceTypeCamera;       

        controller.mediaTypes = @[(__bridge NSString *)kUTTypeImage];     

        controller.allowsEditing = YES;

        controller.delegate = self;     

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

    } else {

        NSLog(@"Camera is not available.");

    }  

}