图片上传处理 图片压缩 图片处理

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];

}

>
> #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 iphoneUIImagePickerController *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];}

-(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 contextUIGraphicsBeginImageContext(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 contextUIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();// End the contextUIGraphicsEndImageContext();// Return the new image.

return newImage;}

图片保存到本地document里面–以及图片格式的转换IOS开发之保存图片到Documents目录及PNG，JPEG格式相互转换- (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];[ipc dismissModalViewControllerAnimated:YES];} else {NSLog(@"MEdia");}

//上面的代码是当从相册里面选取图片之后保存到本地程序沙盒，在上面我们得到的图片中不能够得到图片名字，//以及不清楚图片格式，所以这个时候我们需要将其转换成NSdata二进制存储，image = [info objectForKey:@”UIImagePickerControllerOriginalImage”];NSData *data;if (UIImagePNGRepresentation(image) == nil) {data = UIImageJPEGRepresentation(image, 1);} else {data = UIImagePNGRepresentation(image);}//UIImagePNGRepresentation转换PNG格式的图片为二进制，如果图片的格式为JPEG则返回nil；[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”] contents:data attributes:nil];//将图片保存为JPEG格式//我们也可以写成下面的格式存储图片NSString *pngImage = [filePath stringByAppendingPathComponent:@”Documents/image.png”];NSString *jpgImage = [filePath stringByAppendingPathComponent:@”Documents/image.jpg”];[data writeToFile:pngImage atomically:YES];[data writeToFile:jpgImage atomically:YES];“`