ios 实现图片上传的2种方式
项目中要用到图片上传，开始最早用到的是方式是把image图片转为data 数据，然后用afnetwork 方式上传，后来这个方式改掉，有用到了以文件的形式上传给服务器，2个种方式，文件形式上传比较好点，下面提供所需的大致代码，
第一步先获取图片，相册或者拍照都可以得到图片，然后把图片存datas里，然后发送请求，使用的都是afnetwork自带的方法
//postParameters 数据放到value 里面
NSMutableDictionary* postParameters = [NSMutableDictionary dictionary];
[datas enumerateObjectsUsingBlock:^(NSString* base64String, NSUInteger idx, BOOL *stop) {
NSString* key = [@"image" stringByAppendingFormat:@"%lu", (unsigned long)idx + 1];
//图片都base64 转码，然后放倒value
postParameters[key] = base64String;
}];
NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:@"POST" URLString:"url地址" parameters:postParameters error:NULL];
[request setTimeoutInterval:30];
AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation *operation, id responseObject) {
@try {
NSString* json = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
success(operation, json.JSONValue);
} @catch(NSException* exception) {
failure(operation, @"数据错误");
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
failure(operation, error.localizedDescription);
}
}
}];
这就是简单的data 上传图片，
第二张方式就是图片地址的形式上传图片
同样的方法先是把图片获取到存到沙盒，然后获取地址，具体代码如下
//写入到沙盒,存地址
[photos enumerateObjectsUsingBlock:^(OrderBaskPhoto* photo, NSUInteger idx, BOOL *stop) {
NSString* documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString* totalPath = [documentPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%lu.jpg",(unsigned long)idx]];
[photo.data writeToFile:totalPath atomically:NO];
photo.imagePath=totalPath;
[datas addObject:photo.imagePath];
}];
// 同样要把图片地址转为key－value ，放入字典中
NSMutableDictionary* postParameters = [NSMutableDictionary dictionary];
[datas enumerateObjectsUsingBlock:^(NSString* pathString, NSUInteger idx, BOOL *stop) {
NSString* key = [@"image" stringByAppendingFormat:@"%lu", (unsigned long)idx + 1];
postParameters[key] = [NSURL fileURLWithPath:pathString];
}];然后调用afnetwork 方法
NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:@"POST" URLString:"url地址" parameters:postParameters error:NULL];
[request setTimeoutInterval:30];
AFHTTPRequestOperation *operation=[self POST:urlString parameters:mparameters constructingBodyWithBlock:^(id formData) {
// 这快需要获取图片的本地地址，然后放入formdata中，
[postParameters enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSURL *value, BOOL *stop) {
[formData appendPartWithFileURL:value name:key error:nil];
}];
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
@try {
NSString* json = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
success(operation, json.JSONValue);
} @catch(NSException* exception) {
failure(operation, @"数据错误");
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
failure(operation, error.localizedDescription);
}]; 这样就可以上传图片了，以上就是简单的两种方式上图图片，
在上上传的时候图片有限制，图片需要压缩，所以图片压缩的代码也贴一下
//需要的设置常量
static const NSUInteger kMaxFeedbackTextLength = 200;
static const CGFloat kImageShorterEdgeUppderBound = 720;
//图片处理
- (void)processOriginalImages:(NSArray*)originalImages
{
[self dismissViewControllerAnimated:YES completion:nil];
[self showLoading:nil interactonEnabled:NO];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
__block BOOL illegalImageSelected = NO;
[originalImages enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(NSDictionary* dic, NSUInteger idx, BOOL *stop) {
UIImage* image = dic[UIImagePickerControllerOriginalImage];
if (MAX(image.size.width, image.size.height) / MIN(image.size.width, image.size.height) <= 5) {
CGSize size = image.size;
if (MIN(image.size.width, image.size.height) > kImageShorterEdgeUppderBound) {
if (image.size.width < image.size.height) {
size = CGSizeMake(kImageShorterEdgeUppderBound, (kImageShorterEdgeUppderBound / image.size.width) * image.size.height);
} else {
size = CGSizeMake((kImageShorterEdgeUppderBound / image.size.height) * image.size.width, kImageShorterEdgeUppderBound);
}
} else {
}
//压缩图片方法
image = [image fixOrientationWithSize:size];
NSData* data = UIImageJPEGRepresentation(image, 0.8);
OrderBaskPhoto* photo = [[OrderBaskPhoto alloc] init];
photo.data = data;
//设置缩略图，位图方法
photo.thumbnail = [Utility imageWithImage:image scaledToFillSize:CGSizeMake(80, 80)];
[photos addObject:photo];
} else {
illegalImageSelected = YES;
}
}];
dispatch_sync(dispatch_get_main_queue(), ^{
NSParameterAssert(photos.count <= kMaxImageCount);
if (illegalImageSelected) {
UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"为保证图片浏览体验，请上传高：宽小于等于5的图片" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alertView show];
}
[self dismissLoading];
});
});
}上面用到的方法
//压缩图片的方法
@implementation UIImage (fixOrientation)
- (UIImage *)fixOrientationWithSize:(CGSize)size {
// We need to calculate the proper transformation to make the image upright.
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
CGAffineTransform transform = CGAffineTransformIdentity;
// No-op if the orientation is already correct
if (self.imageOrientation != UIImageOrientationUp) {
switch (self.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, size.width, size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
case UIImageOrientationUp:
case UIImageOrientationUpMirrored:
break;
}
switch (self.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationUp:
case UIImageOrientationDown:
case UIImageOrientationLeft:
case UIImageOrientationRight:
break;
}
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, size.width, size.height,
CGImageGetBitsPerComponent(self.CGImage), 0,
CGImageGetColorSpace(self.CGImage),
CGImageGetBitmapInfo(self.CGImage));
CGContextConcatCTM(ctx, transform);
switch (self.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,size.height,size.width), self.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,size.width,size.height), self.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}//图片等比例缩放
+(UIImage *)imageWithImage:(UIImage *)image scaledToFillSize:(CGSize)size
{
CGFloat scale = MAX(size.width/image.size.width, size.height/image.size.height);
CGFloat width = image.size.width * scale;
CGFloat height = image.size.height * scale;
CGRect imageRect = CGRectMake((size.width - width)/2.0f,
(size.height - height)/2.0f,
width,
height);
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
[image drawInRect:imageRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}以上就是在工作中实现上传图片的过程，谢谢