IOS 图片上传处理 图片压缩 图片处理

概述IOS 图片上传处理 图片压缩 图片处理

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提到从摄像头/相册获取图片是面向终端用户的，由用户去浏览并选择图片为程序使用。在这里，我们需要过UIImagePickerController类来和用户交互。使用UIImagePickerController和用户交互，我们需要实现2个协议<UIImagePickerControllerDelegate,UINavigationControllerDelegate>。VIEw Code代码如下复制代码#pragma mark 从用户相册获取活动图片- (voID)pickImageFromAlbum{    imagePicker = [[UIImagePickerController alloc] init];    imagePicker.delegate =self;    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotolibrary;    imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    imagePicker.allowsEditing =YES;        [self presentModalVIEwController:imagePicker animated:YES];}我们来看看上面的从相册获取图片，我们首先要实例化UIImagePickerController对象，然后设置imagePicker对象为当前对象，设置imagePicker的图片来源为UIImagePickerControllerSourceTypePhotolibrary，表明当前图片的来源为相册，除此之外还可以设置用户对图片是否可编辑。VIEw Code代码如下复制代码#pragma mark 从摄像头获取活动图片- (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];}以上是从摄像头获取图片，和从相册获取图片只是图片来源的设置不一样，摄像头图片的来源为UIImagePickerControllerSourceTypeCamera。　　　　在和用户交互之后，用户选择好图片后，会回调选择结束的方法。-(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.TakePhotoBtn setimage:m_selectimage forState:UIControlStatenormal];        [picker dismissModalVIEwControllerAnimated:YES];       return ;    }    [picker release];}//对图片尺寸进行压缩---(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,newSize.wIDth,newSize.height)];        // Get the new image from the context    UIImage* newImage = UIGraphicsGetimageFromCurrentimageContext();        // End the context    UIGraphicsEndImageContext();        // Return the new image.   return newImage;}

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