ios - 如何在 iOS 中通过 HTTP 请求上传多张图片？

Question

我正在开发客户端-服务器应用程序。我发现很少有教程如何上传一张图片。但是使用单个请求上传多张图片的最佳方式是什么？我是网络编程的新手，所以我不是常用的方法。

任何帮助表示赞赏。

Answer 1

我建议使用ASIHTTPRequest或AFNetworking

两者都有一个您可以使用的网络队列。ASIHTTP 不再被开发，因此如果您想使用正在开发的库，您可以查看 AFNetworking...

Answer 2

您应该使用ASIHTTPRequest库。

然后创建你自己的类来管理你想要的所有请求。这是我的：

#import "ASIFormDataRequest.h"

@interface PostRequest : NSObject {
    id localCopy; // to avoid exec_bad_access with arc
    ASIHTTPRequest *getRequest;
    ASIFormDataRequest *postRequest;
}

@property (nonatomic, retain) id delegate;
@property (nonatomic, readwrite) SEL callback;
@property (nonatomic, readwrite) SEL errorCallback;

- (void)performGetRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector;
- (void)performPostRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary dataDictionary:(NSDictionary *)dataDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector;

@end

//

#import "PostRequest.h"

@implementation PostRequest

@synthesize delegate;
@synthesize callback, errorCallback;

- (void)performGetRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector {

    localCopy = self;

    self.delegate = requestDelegate;
    self.callback = requestSelector;
    self.errorCallback = errorSelector;

    NSMutableString *requestStringData = [[NSMutableString alloc] init];
    if (stringDictionary)
        for (NSString *key in [stringDictionary allKeys])
            [requestStringData appendFormat:@"%@=%@&", key, [stringDictionary objectForKey:key]];
    NSString *resultString = [requestStringData substringToIndex:[requestStringData length]-1];

    getRequest = [[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@?%@", string, [resultString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
    [getRequest setDelegate:self];
    [getRequest setRequestMethod:@"GET"];

    //NSLog(@"request url = %@", [getRequest.url absoluteString]);
    [getRequest startAsynchronous];
}

- (void)performPostRequestWithString:(NSString *)string stringDictionary:(NSDictionary *)stringDictionary dataDictionary:(NSDictionary *)dataDictionary delegate:(id)requestDelegate requestSelector:(SEL)requestSelector errorSelector:(SEL)errorSelector {

    localCopy = self;

    self.delegate = requestDelegate;
    self.callback = requestSelector;
    self.errorCallback = errorSelector;

    NSURL *url = [NSURL URLWithString:string];

    postRequest = [[ASIFormDataRequest alloc] initWithURL:url];
    [postRequest setDelegate:self];
    [postRequest setRequestMethod:@"POST"];

    if (stringDictionary)
        for (NSString *key in [stringDictionary allKeys])
            [postRequest setPostValue:[stringDictionary objectForKey:key] forKey:key];

    if (dataDictionary)
        for (NSString *key in [dataDictionary allKeys])
            [postRequest setData:[dataDictionary objectForKey:key] forKey:key];

    //NSLog(@"request url = %@", [postRequest.url absoluteString]);
    [postRequest startAsynchronous];
}

#pragma mark - ASIHTTPRequest Delegate Implementation

- (void)requestFinished:(ASIHTTPRequest *)crequest {
    NSString *status = [crequest responseString];

    if (self.delegate && self.callback) {
        if([self.delegate respondsToSelector:self.callback])
            [self.delegate performSelectorOnMainThread:self.callback withObject:status waitUntilDone:YES];
        else
            NSLog(@"No response from delegate");
    }
    localCopy = nil;
}
- (void)requestFailed:(ASIHTTPRequest *)crequest {
    if (self.delegate && self.errorCallback) {
        if([self.delegate respondsToSelector:self.errorCallback])
            [self.delegate performSelectorOnMainThread:self.errorCallback withObject:crequest.error waitUntilDone:YES];
        else
            NSLog(@"No response from delegate");
    }
    localCopy = nil;
}

@end

要使用它，只需导入PostRequest.h您的UIViewController并执行以下操作：

[requestManager performGetRequestWithString:tempString stringDictionary:stringDictionary dataDictionary:dataDictionary delegate:self requestSelector:@selector(requestSucceeded:) errorSelector:@selector(requestFailed:)];

参数：

• (NSString *)string- url 字符串，在哪里发布您的请求；
• (NSDictionary *)stringDictionary- 字典，包含所有文本信息（如姓名、ID 等）；
• (NSDictionary *)dataDictionary- 字典，包含所有数据信息（如照片、文件等）；
• (id)requestDelegate- 委托执行以下选择器；
• (SEL)requestSelector- 选择器，将在成功请求时执行；
• (SEL)errorSelector- 选择器，将在发生错误时执行。