谷歌图像搜索iPhone URL数据

Question

我想做一个简单的谷歌图像搜索，并为我正在搜索的字符串返回一个图像。当我完成时，图像为空，我做错了什么？以下代码：

-(void)getGoogleImage
{
    NSString *google = [NSString stringWithFormat:@"%@",[[NSUserDefaults standardUserDefaults]objectForKey:@"string"]];
    NSString *newGoogle = [google stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
    NSString *fullGoogle = [NSString stringWithFormat:@"https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=%@",newGoogle];
    NSURL * url = [NSURL URLWithString:fullGoogle];
    NSURLRequest * request = [NSURLRequest requestWithURL:url
                                              cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:60];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"Did Recieve Response");
    responseData = [[NSMutableData alloc]init];
}
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
    NSLog(@"Did Recieve Data");
    [responseData appendData:data];
}
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
    NSLog(@"Did Fail");
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"Did Finish");
    image = [[UIImage alloc]initWithData:responseData];
}

当我搜索狗时，我在网络浏览器中得到了这个：

{"responseData": {"results":[{"GsearchResultClass":"GimageSearch","width":"220","height":"211","imageId":"ANd9GcTZKvO0mDGuDdifdhW3TEG8bmcPM23DMGEB4wevzBuIPp7HMMwQ3dTetVc","tbWidth":"107","tbHeight":"103","unescapedUrl":"http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Timba%2B1.jpg/220px-Timba%2B1.jpg","url":"http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Timba%252B1.jpg/220px-Timba%252B1.jpg","visibleUrl":"en.wikipedia.org","title":"u003cbu003eDogu003c/bu003e - Wikipedia, the free encyclopedia","titleNoFormatting":"Dog - Wikipedia, the free encyclopedia","originalContextUrl":"http://en.wikipedia.org/wiki/Dog","content":"the appropriate-sized u003cbu003edogu003c/bu003e","contentNoFormatting":"the appropriate-sized dog","tbUrl":"http://t0.gstatic.com/images?qu003dtbn:ANd9GcTZKvO0mDGuDdifdhW3TEG8bmcPM23DMGEB4wevzBuIPp7HMMwQ3dTetVc"},{"GsearchResultClass":"GimageSearch","width":"170","height":"224","imageId":"ANd9GcTycy7IfwO9VLFIftSa7yNZj1b_BP583qUQ0UmSZnog_jdhdwvewcWvrw","tbWidth":"82","tbHeight":"108","unescapedUrl":"http://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Golden_retriever_eating_pigs_foot.jpg/170px-Golden_retriever_eating_pigs_foot.jpg","url":"http://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Golden_retriever_eating_pigs_foot.jpg/170px-Golden_retriever_eating_pigs_foot.jpg","visibleUrl":"en.wikipedia.org","title":"u003cbu003eDogu003c/bu003e - Wikipedia, the free encyclopedia","titleNoFormatting":"Dog - Wikipedia, the free encyclopedia","originalContextUrl":"http://en.wikipedia.org/wiki/Dog","content":"See also: u003cbu003eDogu003c/bu003e food","contentNoFormatting":"See also: Dog food","tbUrl":"http://t1.gstatic.com/images?qu003dtbn:ANd9GcTycy7IfwO9VLFIftSa7yNZj1b_BP583qUQ0UmSZnog_jdhdwvewcWvrw"},{"GsearchResultClass":"GimageSearch","width":"334","height":"360","imageId":"ANd9GcTsX8rcRiPIMso7akKaQmVP4PzMwoAfbVnlc6KkPNG5jpU7wfyZNWy1oNs","tbWidth":"112","tbHeight":"121","unescapedUrl":"http://www.petscarecenter.com/wp-content/uploads/2011/05/dog.jpg","url":"http://www.petscarecenter.com/wp-content/uploads/2011/05/dog.jpg","visibleUrl":"www.petscarecenter.com","title":"Tips for u003cbu003eDogu003c/bu003e Care","titleNoFormatting":"Tips for Dog Care","originalContextUrl":"http://www.petscarecenter.com/dog-care/tips-for-dog-care.html","content":"Since u003cbu003edogsu003c/bu003e are known for the","contentNoFormatting":"Since dogs are known for the","tbUrl":"http://t0.gstatic.com/images?qu003dtbn:ANd9GcTsX8rcRiPIMso7akKaQmVP4PzMwoAfbVnlc6KkPNG5jpU7wfyZNWy1oNs"},{"GsearchResultClass":"GimageSearch","width":"400","height":"366","imageId":"ANd9GcS6VxIzGltwNb2PWMGDfoBvvuof26Kn9i_BrXYRvgWqpnnT3UNfy5DYyC8","tbWidth":"124","tbHeight":"113","unescapedUrl":"http://static.ddmcdn.com/gif/dog-best-friend-1.jpg","url":"http://static.ddmcdn.com/gif/dog-best-friend-1.jpg","visibleUrl":"animals.howstuffworks.com","title":"Is a u003cbu003edogu003c/bu003e really a manu0026#39;s best friend?: u003cbu003eDogu003c/bu003e Care: Animal Planet","titleNoFormatting":"Is a dog really a manu0026#39;s best friend?: Dog Care: Animal Planet","originalContextUrl":"http://animals.howstuffworks.com/pets/dog-best-friend.htm","content":"u003cbu003eDogu003c/bu003e Image Gallery","contentNoFormatting":"Dog Image Gallery","tbUrl":"http://t3.gstatic.com/images?qu003dtbn:ANd9GcS6VxIzGltwNb2PWMGDfoBvvuof26Kn9i_BrXYRvgWqpnnT3UNfy5DYyC8"}],"cursor":{"resultCount":"3,460,000,000","pages":[{"start":"0","label":1},{"start":"4","label":2},{"start":"8","label":3},{"start":"12","label":4},{"start":"16","label":5},{"start":"20","label":6},{"start":"24","label":7},{"start":"28","label":8}],"estimatedResultCount":"3460000000","currentPageIndex":0,"moreResultsUrl":"http://www.google.com/images?oeu003dutf8u0026ieu003dutf8u0026sourceu003dudsu0026startu003d0u0026hlu003denu0026qu003ddog","searchResultTime":"0.07"}}, "responseDetails": null, "responseStatus": 200}

Answer 1

而不是像您那样手动对url进行url编码：

NSString *google = [NSString stringWithFormat:@"%@",[[NSUserDefaults standardUserDefaults]objectForKey:@"string"]];
NSString *newGoogle = [google stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
NSString *fullGoogle = [NSString stringWithFormat:@"https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=%@",newGoogle];
NSURL * url = [NSURL URLWithString:fullGoogle];
NSURLRequest * request = [NSURLRequest requestWithURL:url
                                          cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:60];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

试试这个方法：

- (NSString *)stringByAddingPercentEscapesUsingEncoding:(NSStringEncoding)encoding

它对url进行了更准确的编码：

NSString *google = [NSString stringWithFormat:@"%@",[[NSUserDefaults standardUserDefaults]objectForKey:@"string"]];
NSString *fullGoogle = [NSString stringWithFormat:@"https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=%@",google];
NSString * urlEncoded = [fullGoogle stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL * url = [NSURL URLWithString:urlEncoded];
NSURLRequest * request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:60];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

也许这是你的问题，希望能有所帮助！

Answer 2

在connectionDidFinish 中需要这个

NSError* error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
NSDictionary *test = [json objectForKey:@"responseData"];
NSDictionary *closer = [test objectForKey:@"results"];
NSArray *closest = [closer valueForKey:@"url"];