iOS图片上传及处理

从摄像头或者是从相册中读取图片，需要通过UIImagePickerController类来实现，在使用UIImagePickerController时，需要是实现下面两个协议

 

 

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1	<uinavigationcontrollerdelegate,uiimagepickercontrollerdelegate></uinavigationcontrollerdelegate,uiimagepickercontrollerdelegate>

 

 

1、从相册中读取图片

首先要实例化UIImagePickerController对象imagePicker，设置imagePicker的图片来源为UIImagePickerControllerSourceTypePhotoLibrary，表明当前图片的来源为用户的相册。以及设置图片是否可被编辑allowsEditing。

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#pragma mark - 从用户相册获取图片 - (void)pickImageFromAlbum {     imagePicker = [[UIImagePickerController alloc] init];     imagePicker.delegate =self;     imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;     imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;     imagePicker.allowsEditing =YES;           [self presentModalViewController:imagePicker animated:YES]; }

2、从相册中读取图片

 

 

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#pragma mark - 从摄像头获取图片 - (void)pickImageFromCamera {     imagePicker = [[UIImagePickerController alloc] init];     imagePicker.delegate =self;     imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;     imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;     imagePicker.allowsEditing =YES;           [self presentModalViewController:imagePicker animated:YES]; } //打开相机 - (IBAction)touch_photo:(id)sender {     // for iphone     UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {         pickerImage.sourceType = UIImagePickerControllerSourceTypeCamera;         pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];               }     pickerImage.delegate =self;     pickerImage.allowsEditing =YES;//自定义照片样式     [self presentViewController:pickerImage animated:YES completion:nil]; }

在用户现则好图片后，会回调选择结束的方法

 

 

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-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {     //初始化imageNew为从相机中获得的--     UIImage *imageNew = [info objectForKey:@UIImagePickerControllerOriginalImage];     //设置image的尺寸     CGSize imagesize = imageNew.size;     imageSize.height =626;     imageSize.width =413;     //对图片大小进行压缩--     imageNew = [self imageWithImage:imageNew scaledToSize:imageSize];     NSData *imageData = UIImageJPEGRepresentation(imageNew,0.00001);    if(m_selectImage==nil)     {         m_selectImage = [UIImage imageWithData:imageData];         NSLog(@m_selectImage:%@,m_selectImage);         [self.takePhotoButton setImage:m_selectImage forState:UIControlStateNormal];         [picker dismissModalViewControllerAnimated:YES];        return ;     } }

对图片进行压缩

 

 

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-(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize {     // Create a graphics image context     UIGraphicsBeginImageContext(newSize);           // Tell the old image to draw in this new context, with the desired     // new size     [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];           // Get the new image from the context     UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();           // End the context     UIGraphicsEndImageContext();           // Return the new image.    return newImage; }

将图片保存到Documents目录及PNG、JPEG格式相互转换

 

 

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- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {     NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];     if ([mediaType isEqualToString:@public.image]){         image = [info objectForKey:@UIImagePickerControllerOriginalImage];         NSData *data;         if (UIImagePNGRepresentation(image) == nil) {             data = UIImageJPEGRepresentation(image, 1);         } else {             data = UIImagePNGRepresentation(image);         }                   NSFileManager *fileManager = [NSFileManager defaultManager];         NSString *filePath = [NSString stringWithString:[self getPath:@image1]];         //将图片存储到本地documents          [fileManager createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];          [fileManager createFileAtPath:[filePath stringByAppendingString:@/image.png] contents:dataAttributes:nil];                   UIImage *editedImage = [[UIImage alloc] init];         editedImage = image;         CGRect rect = CGRectMake(0, 0, 64, 96);         UIGraphicsBeginImageContext(rect.size);         [editedImage drawInRect:rect];         editedImage = UIGraphicsGetImageFromCurrentImageContext();                   UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];         imageButton.frame = CGRectMake(10, 10, 64, 96);         [imageButton setImage:editedImage forState:UIControlStateNormal];         [self.view addSubview:imageButton];         [imageButton addTarget:self action:@selector(imageAction:)forControlEvents:UIControlEventTouchUpInside];         [self dismissModalViewControllerAnimated:YES];     } else {         NSLog(@Media);     }

在上面的方法中不能得到图片的名称及格式，所以需要将其转换成NSData二进制存储

 

 

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image = [info objectForKey:@UIImagePickerControllerOriginalImage]; NSData *data;         if (UIImagePNGRepresentation(image) == nil) {             data = UIImageJPEGRepresentation(image, 1);         } else {             data = UIImagePNGRepresentation(image);         }

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1 2	[fileManager createFileAtPath:[filePath stringByAppendingString:@/image.png] contents:data attributes:nil];  //将图片保存为PNG格式  [fileManager createFileAtPath:[filePath stringByAppendingString:@/image.jpg