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（1）方式一
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（2）方式二
请求头 （图片来自Charles 4.5.6）
移动端在图片上传完成后可以让服务端将上传成功的图片的url返回给你
实际开发过程中很有可能会遇到一些比较麻烦的需求:这里就分享下上传图片的时候限制上传的图片的大小的问题,调用系统相册以及调用照相机的实现我就不详细说了,这里主要说一下压缩图片至1M以内的实现,顺带着将file进行base64转码的方法说一下,以下进入主题:
// 选中照片之后的回调方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
// 先dismiss调选取照片的VC,在completion block里面完成以下几个操作:
[self dismissViewControllerAnimated:YES completion:^{
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
// 拍照存入相册
if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
// 判断哪个视图需要照片
UIImage *tempImage = nil;
NSString *imageName = nil;
// 这里注意下:如果有多个上传图片的选项,可以给每个选项设置一个类型,然后每个选项根据相应的类型来设置不同的imageName即可.暂时我只设置一个值,如@"test.jpeg".
imageName = @"test.jpeg";
// 这里:如果有多个上传图片的选项,且给每个选项设置一个类型,这时就可以根据imageName的值的不同,写入本地之后返回的image值也就不同..
// 将返回的本地的图片赋值给tempImage
tempImage = [self writeToCachesWithImage:image imageName:imageName];
// 下面就是调用你自己的上传图片的网络请求了,这是我的网络请求封装的方法....
[self uploadImageWithImage:tempImage imageName:imageName];
}];
}
// 把上传需要的图片转为字符串
- (NSData *)stringWithImage:(UIImage *)image imageName:(NSString *)imageName
{
NSString *imagePath = [[self postImagePathWithFileName:certificationFileName] stringByAppendingPathComponent:imageName];
NSData *imageData = nil;
CGFloat mb = 1.0; // 1MB
CGFloat uploadMB = 1.0; // 1M
CGFloat itemMB = 0; // 把文件转成MB
if ([[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
long long imageSize = [[[NSFileManager defaultManager] attributesOfItemAtPath:imagePath error:nil] fileSize];
itemMB = imageSize / (mb * 1024 * 1024) ;
} else {
CGImageRef cgImageRef = image.CGImage;
size_t bpp = CGImageGetBitsPerPixel(cgImageRef);
size_t bpc = CGImageGetBitsPerComponent(cgImageRef);
size_t bytes_per_pixel = bpp / bpc;
CGFloat lPixelsPerMB = mb / bytes_per_pixel;
CGFloat totalPixel = CGImageGetWidth(cgImageRef) * CGImageGetHeight(cgImageRef);
itemMB = totalPixel / lPixelsPerMB;
}
if (itemMB = uploadMB) {
imageData = UIImageJPEGRepresentation(image, 1.0f);
} else {
// 大于1M压到1M
CGSize imageSize = image.size;
CGSize toImageSize = CGSizeZero;
if (imageSize.width imageSize.height) {
toImageSize = CGSizeMake(1024, 1024 * imageSize.height / imageSize.width);
} else if (imageSize.width imageSize.height) {
toImageSize = CGSizeMake(1024 * imageSize.width / imageSize.height, 1024);
} else {
toImageSize = CGSizeMake(sqrt(1048576), sqrt(1048576));
}
UIImage *toImage = [image imageCompressForSize:image targetSize:toImageSize];
imageData = UIImageJPEGRepresentation(toImage, 1.f);
}
// 这里注意下:根据你们自己的需要转成不同类型的NSData字节流...
// 这是不用base64转码返回的string
return imageData;
// 这是用base64转码返回的string,1.0上传的方式
// Byte *byte = (Byte *)[imageData bytes];
// return [NSString stringWithFormat:@"jpeg@%@", [GTMBase64 stringByEncodingBytes:byte length:imageData.length]];
}
/* 上传的图片所在的沙盒文件夹
* @param : fileName 文件的名称.
* @param : return 文件的存储路径
*/
- (NSString *)postImagePathWithFileName:(NSString *)fileName
{
NSString *imagePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:fileName];
if (![[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
[[NSFileManager defaultManager] createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:nil];
}
return imagePath;
}
/*
* 把图片存入本地并返回
* @param : image 选中的image
* @param : imageName 图片的名称
* @return : UIImage
*/
- (UIImage *)writeToCachesWithImage:(UIImage *)image imageName:(NSString *)imageName
{
NSString *imagePath = [[self postImagePathWithFileName:certificationFileName] stringByAppendingPathComponent:imageName];
BOOL isResult = [UIImageJPEGRepresentation(image, 1.0f) writeToFile:imagePath atomically:YES];
if (isResult) {
// 写入成功，把图片取出来
UIImage *certificationImage = [UIImage imageWithContentsOfFile:imagePath];
return certificationImage;
} else {
// 写入失败，直接返回原始图片
return image;
}
}
1.新建一个single view工程，导入ASIHttpRequest库，导入MobileCoreServices、CFNetwork、SystemConfiguration和libz1.2.5.dylib四个系统库
2.随便导入一张图片，比如haoyou.png
3.ViewController.h
#import uikit uikit.h=""
#import "ASIHTTPRequest.h"
#import "ASIFormDataRequest.h"
@interface ViewController : UIViewController
@property (nonatomic, copy)NSString *m_auth;
@end/asihttprequestdelegate/uikit
4.ViewController.m 添加两个按钮
(void)viewDidLoad {
[super viewDidLoad];
UIButton *loginBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
loginBtn.frame = CGRectMake(100, 20, 120, 40);
[loginBtn setTitle:@"登录" forState:UIControlStateNormal];
[loginBtn addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:loginBtn];
UIButton *uploadBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
uploadBtn.frame = CGRectMake(100, 80, 120, 40);
[uploadBtn setTitle:@"上传" forState:UIControlStateNormal];
[uploadBtn addTarget:self action:@selector(upload) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:uploadBtn];
}
5.实现login和upload两个方法
- (void)login {
NSURL *url = [NSURL URLWithString:@"..."];//此处省略请求url
//请求
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
request.tag = 10;
request.delegate = self;
[request startAsynchronous];
}
- (void)upload {
NSURL* url = [NSURL URLWithString:@"..."];//此处省略请求url
UIImage* img = [UIImage imageNamed:@"haoyou.png"];
NSData* data = UIImagePNGRepresentation(img);
//ASIFormDataRequest请求是post请求，可以查看其源码
ASIFormDataRequest* request = [ASIFormDataRequest requestWithURL:url];
request.tag = 20;
request.delegate = self;
[request setPostValue:self.m_auth forKey:@"m_auth"];
// [request setFile:@"tabbar.png" forKey:@"haoyou"];//如果有路径，上传文件
[request setData:data withFileName:@"tmp.png" andContentType:@"image/png" forKey:@"headimage"];
// 数据 文件名,随便起 文件类型 设置key
[request startAsynchronous];
}
6.实现协议
- (void)requestFailed:(ASIHTTPRequest *)request {
NSLog(@"请求失败");
}
- (void)requestFinished:(ASIHTTPRequest *)request {
if (request.tag == 10) {
NSDictionary * dic = [NSJSONSerialization JSONObjectWithData:request.responseData options:0 error:nil];
self.m_auth = [dic objectForKey:@"m_auth"];
NSLog(@"%@", self.m_auth);
}
if (request.tag == 20) {
NSLog(@"%@", request.responseString);
}
}