UIImagePickerController 调用摄像头和相册

按钮点击调用

//拍照按钮
    UIButton *button5 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button5.frame = CGRectMake(50, 10, 220, 40);
    [button5 setTitle:@"拍照" forState:UIControlStateNormal];
    [button5 addTarget:self action:@selector(pickPhotoFromCamera:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button5];
    h += 60 +interval;
    
    //本地照片按钮
    UIButton *button6 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button6.frame = CGRectMake(50, 60, 220, 40);
    [button6 setTitle:@"相册" forState:UIControlStateNormal];
    [button6 addTarget:self action:@selector(pickPhotoFromAlbum:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button6];

//选择拍照
-(void)pickPhotoFromCamera:sender{
    _imagePickerController = [[UIImagePickerController alloc] init];
    _imagePickerController.delegate = self;
    _imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    _imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    _imagePickerController.allowsEditing = YES;
    [self presentModalViewController:_imagePickerController animated:YES];
    
}
//选择相册
-(void)pickPhotoFromAlbum:sender{
    _imagePickerController = [[UIImagePickerController alloc] init];
    _imagePickerController.delegate = self;
    _imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    _imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    _imagePickerController.allowsEditing = YES;
    [self presentModalViewController:_imagePickerController animated:YES];
}

UIImagePickerControllerDelegate Methods

#pragma mark UIImagePickerControllerDelegate Methods
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    BOOL success;
    //文件管理器
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    //当选择的类型是图片
    if ([mediaType isEqualToString:@"public.image"]){
        UIImage *image1 = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        image1 = [UIImagefixOrientation fixOrientation:image1];
        //先把图片转成NSData
        NSData *data;
        if (UIImagePNGRepresentation(image1) == nil){
            data = UIImageJPEGRepresentation(image1, 1.0);
        }else{
            data = UIImagePNGRepresentation(image1);
        }
        NSTimeInterval time = [[NSDate date] timeIntervalSince1970];
        // 将double转为long long型
        long long dTime = [[NSNumber numberWithDouble:time] longLongValue];
        // 输出long long型
        NSString *photoName = [NSString stringWithFormat:@"%llu.png",dTime];
        //图片保存的路径
        //这里将图片放在沙盒的documents文件夹中
        //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:[GlobalSingleton sharedSingleton].documentsDirectory withIntermediateDirectories:YES attributes:nil error:nil];
        [fileManager createFileAtPath:[[GlobalSingleton sharedSingleton].documentsDirectory stringByAppendingPathComponent:photoName] contents:data attributes:nil];
        [picker dismissModalViewControllerAnimated:YES];
　　　　　　//以下是自定义后续处理
        _photoPath = photoName;
        _imageView.image = image1;
　　　　//解决图片旋转90度显示的问题
        _imageView.frame = [UIImagefixOrientation makeRectWithImageWidth:image1.size.width imageHeight:image1.size.height viewWidth:_imageView.frame.size.width viewHeight:_imageView.frame.size.height positionX:_imageView.frame.origin.x positionY:_imageView.frame.origin.y];
    }else if([mediaType isEqualToString:@"public.movie"]){//选择视频
        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
        NSLog(@"%@",videoURL);
        NSLog(@"found a video");
        NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
        NSString *videoFile = [[GlobalSingleton sharedSingleton].documentsDirectory stringByAppendingPathComponent:@"temp.mov"];
        NSLog(@"%@",videoFile);
        success = [fileManager fileExistsAtPath:videoFile];
        if(success) {
            success = [fileManager removeItemAtPath:videoFile error:&error];
        }
        [videoData writeToFile:videoFile atomically:YES];
    }
    [_imagePickerController dismissModalViewControllerAnimated:YES];
}
//取消选择
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [_imagePickerController dismissModalViewControllerAnimated:YES];
}

//解决图片旋转90度显示的方法

/**
 拍照时旋转90度，保存时调整回来
 */
+(UIImage *)fixOrientation:(UIImage *)aImage {
    
    // No-op if the orientation is already correct
    if (aImage.imageOrientation == UIImageOrientationUp)
        return aImage;
    
    // We need to calculate the proper transformation to make the image upright.
    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
    CGAffineTransform transform = CGAffineTransformIdentity;
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;
            
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;
            
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        default:
            break;
    }
    
    switch (aImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
            
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        default:
            break;
    }
    
    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
                                             CGImageGetBitsPerComponent(aImage.CGImage), 0,
                                             CGImageGetColorSpace(aImage.CGImage),
                                             CGImageGetBitmapInfo(aImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (aImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
            break;
            
        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
            break;
    }
    
    // And now we just create a new UIImage from the drawing context
    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
    UIImage *img = [UIImage imageWithCGImage:cgimg];
    CGContextRelease(ctx);
    CGImageRelease(cgimg);
    return img;
}