iOS圖片上傳及處理

iOS圖片上傳及處理

 

從網路攝影機或者是從相簿中讀取圖片，需要通過UIImagePickerController類來實現，在使用UIImagePickerController時，需要是實現下面兩個協議

 

 

 

 

1、從相簿中讀取圖片

首先要執行個體化UIImagePickerController對象imagePicker，設定imagePicker的圖片來源為UIImagePickerControllerSourceTypePhotoLibrary，表明當前圖片的來源為使用者的相簿。以及設定圖片是否可被編輯allowsEditing。

#pragma mark - 從使用者相簿擷取圖片- (void)pickImageFromAlbum{    imagePicker = [[UIImagePickerController alloc] init];    imagePicker.delegate =self;    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    imagePicker.allowsEditing =YES;        [self presentModalViewController:imagePicker animated:YES];}

2、從相簿中讀取圖片

 

 

#pragma mark - 從網路攝影機擷取圖片- (void)pickImageFromCamera{    imagePicker = [[UIImagePickerController alloc] init];    imagePicker.delegate =self;    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;    imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    imagePicker.allowsEditing =YES;        [self presentModalViewController:imagePicker animated:YES];}//開啟相機- (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;//自訂照片樣式    [self presentViewController:pickerImage animated:YES completion:nil];}

在使用者現則好圖片後，會回調選擇結束的方法

 

 

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info{    //初始化imageNew為從相機中獲得的--    UIImage *imageNew = [info objectForKey:@UIImagePickerControllerOriginalImage];    //設定image的尺寸    CGSize imagesize = imageNew.size;    imageSize.height =626;    imageSize.width =413;    //對圖片大小進行壓縮--    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 ;    }}

對圖片進行壓縮

 

 

-(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;}

將圖片儲存到Documents目錄及PNG、JPEG格式相互轉換

 

 

- (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]];         //將圖片儲存到本地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圖片的名稱及格式，所以需要將其轉換成NSData二進位儲存

 

 

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

[fileManager createFileAtPath:[filePath stringByAppendingString:@/image.png] contents:data attributes:nil];  //將圖片儲存為PNG格式 [fileManager createFileAtPath:[filePath stringByAppendingString:@/image.jpg] contents:data attributes:nil]; //將圖片儲存為JPEG格式