iOS開發中關于圖片上傳，一般有兩種方法:
1.自己手動寫（如：NSURLMutableRequest等系統類），實現起來比較復雜，暫且不提
2.使用第三方（如：主流的AFNetworking），在開發中使用第三方比較多，下面就是使用AFN上傳圖片的流程：
//獲取圖片
-(void)avatarTap:(id)sender{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"設置頭像" message:@"" preferredStyle:UIAlertControllerStyleAlert];
//取消
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
NSLog(@"The \"Okay/Cancel\" alert's cancel action occured.");
}];
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
imagePicker.allowsEditing = YES;
imagePicker.delegate = self;
//從相冊中選擇
UIAlertAction* fromPhotosAlbumAction = [UIAlertAction actionWithTitle:@"從相冊選擇" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentViewController:imagePicker animated:YES completion:nil];
}];
//從圖庫選擇
UIAlertAction* fromPhotoAction = [UIAlertAction actionWithTitle:@"從圖庫選擇" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:imagePicker animated:YES completion:nil];
}];
//相機拍攝
UIAlertAction* fromCameraAction = [UIAlertAction actionWithTitle:@"相機拍攝" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:imagePicker animated:YES completion:nil]; }
}];
[alertController addAction:cancelAction];
[alertController addAction:fromCameraAction];
[alertController addAction:fromPhotoAction];
[alertController addAction:fromPhotosAlbumAction];
[self presentViewController:alertController animated:YES completion:nil];
}
//如何進行壓縮
//將圖片尺寸改為240x240
UIImage *smallImage=[self scaleFromImage:image toSize:CGSizeMake(240.0f, 240.0f)];
//寫入jpg文件
[UIImageJPEGRepresentation(smallImage, 1.0f) writeToFile:imageFilePath atomically:YES];
//+ (UIImage *)imageWithCGImage:(CGImageRef)cgImage scale:(CGFloat)scale orientation:(UIImageOrientation)orientation NS_AVAILABLE_IOS(4_0);**
//該方法使用一個CGImageRef創建UIImage，在創建時還可以指定放大倍數以及旋轉方向。當scale設置為1的時候，新創建的圖像將和原圖像尺寸一摸一樣，而orientaion則可以指定新的圖像的繪制方向。
//也可以用這個方法進行壓縮你會發現得到的大小會小了很多倍，如果想測試的話可以轉換成 NSData 打印一下。
//獲取壓縮后的圖片
+ (UIImage *) scaleFromImage: (UIImage *) imagetoSize: (CGSize)size{
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
#pragma mark - 圖片上傳
//上傳圖片(單張)
+(void)uploadPhotoAndController:(UIViewController *)controller WithSize:(CGSize)size Image:(UIImage*)image AndFinish:(void (^)(NSDictionary *, NSError *))finish
{
//加載提示菊花
MBProgressHUD *hud;
if(controller){
hud = [MBProgressHUD showHUDAddedTo:controller.view animated:YES];
hud.label.text = NSLocalizedString(@"加載中...", @"HUD loading title");
}
//1. 存放圖片的服務器地址，這里我用的宏定義
NSString * url = [NSString stringWithFormat:@"%@%@",Hx_Main_heard_API,IMAGE_UPLOAD_URL_API];
//2. 利用時間戳當做圖片名字
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyyMMddHHmmss";
NSString *imageName = [formatter stringFromDate:[NSDate date]];
NSString *fileName = [NSString stringWithFormat:@"%@.jpg",imageName];
//3. 圖片二進制文件
NSData *imageData = UIImageJPEGRepresentation(image, 0.7f);
NSLog(@"upload image size: %ld k", (long)(imageData.length / 1024));
//4. 發起網絡請求
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
[manager POST:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
// 上傳圖片，以文件流的格式，這里注意：name是指服務器端的文件夾名字
[formData appendPartWithFileData:imageData name:@"file" fileName:fileName mimeType:@"image/jpeg"];
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
//上傳成功時的回調
[hud hideAnimated:YES];
NSLog(@"%@",responseObject);
finish(responseObject,nil);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//失敗時的回調
[hud hideAnimated:YES];
finish(nil,error);
}];
}
// 上傳圖片（多張）
+(void)uploadPhotoAndController:(UIViewController *)controller WithSize:(CGSize)size Image:(UIImage*)image AndFinish:(void (^)(NSDictionary *, NSError *))finish
{
//加載提示菊花
MBProgressHUD *hud;
if(controller){
hud = [MBProgressHUD showHUDAddedTo:controller.view animated:YES];
hud.label.text = NSLocalizedString(@"加載中...", @"HUD loading title");
}
//1. 存放圖片的服務器地址，這里我用的宏定義
NSString * url = [NSString stringWithFormat:@"%@%@",Hx_Main_heard_API,IMAGE_UPLOAD_URL_API];
//2. 發起網絡請求
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
[manager POST:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
{
// 上傳多張圖片
for(NSInteger i = 0; i < self.imageDataArray.count; i++)
{
//取出單張圖片二進制數據
NSData * imageData = self.imageDataArray[i];
// 上傳的參數名，在服務器端保存文件的文件夾名
NSString * Name = [NSString stringWithFormat:@"%@%ld", Image_Name, i+1];
// 上傳filename
NSString * fileName = [NSString stringWithFormat:@"%@.jpg", Name];
[formData appendPartWithFileData:imageData name:Name fileName:fileName mimeType:@"image/jpeg"];
}
}
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
//上傳成功時的回調
[hud hideAnimated:YES];
NSLog(@"%@",responseObject);
finish(responseObject,nil);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
//失敗時的回調
[hud hideAnimated:YES];
finish(nil,error);
}];
}
