objective-c google 静态地图 returns 无

objective-c google static map returns nil

这是我的代码:

#define GOOGLE_STATIC_MAP_IMAGE @"https://maps.googleapis.com/maps/api/staticmap?center=%@&zoom=15&size=320x150&maptype=roadmap&markers=color:green|label:H|%@"

-(UIImage*)GetGoogleStaticMap
{
    NSString* coordinates = [NSString stringWithFormat:@"%f,%f", latitude, longitude];
    NSString *stringURL = [NSString stringWithFormat:GOOGLE_STATIC_MAP_IMAGE, coordinates, coordinates]; //coordinates x2 = for the center & the marker
    NSURL *url = [NSURL URLWithString:stringURL];
    NSData *imageData = [[NSData alloc] initWithContentsOfURL:url];
    UIImage *image = [UIImage imageWithData:imageData];

    return image;
}

如果我将 stringURL 粘贴到浏览器,我会得到想要的结果,但是 imageData returns nil - ideas?

可能由于字符串中的某些字符而返回 nil。

在创建 url 对象之前尝试在 stringURL 上调用 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding

例如:

newStringURL = [stringURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];