这是在编译时给我错误的方法(请参见requestMainPage方法)
- (void)loginToMistarWithPin:(NSString *)pin password:(NSString *)password success:(void (^)(void))successHandler failure:(void (^)(void))failureHandler {
NSURL *url = [NSURL URLWithString:@"https://mistar.oakland.k12.mi.us/novi/StudentPortal/Home/Login"];
//Create and send request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setHTTPMethod:@"POST"];
NSString *postString = [NSString stringWithFormat:@"Pin=%@&Password=%@",
[self percentEscapeString:pin],
[self percentEscapeString:password]];
NSData * postBody = [postString dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:postBody];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse
*response, NSData *data, NSError *error)
{
// do whatever with the data...and errors
if ([data length] > 0 && error == nil) {
NSError *parseError;
NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
if (responseJSON) {
// the response was JSON and we successfully decoded it
NSLog(@"Response was = %@", responseJSON);
// assuming you validated that everything was successful, call the success block
if (successHandler)
successHandler();
} else {
// the response was not JSON, so let's see what it was so we can diagnose the issue
NSString *loggedInPage = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Response was not JSON (from login), it was = %@", loggedInPage);
if (failureHandler)
failureHandler();
}
}
else {
NSLog(@"error: %@", error);
if (failureHandler)
failureHandler();
}
}]; }
- (NSData *)requestMainPage {
NSData *returner;
//Now redirect to assignments page
NSURL *homeURL = [NSURL URLWithString:@"https://mistar.oakland.k12.mi.us/novi/StudentPortal/Home/PortalMainPage"];
NSMutableURLRequest *requestHome = [[NSMutableURLRequest alloc] initWithURL:homeURL];
[requestHome setHTTPMethod:@"GET"]; // this looks like GET request, not POST
[NSURLConnection sendAsynchronousRequest:requestHome queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *homeResponse, NSData *homeData, NSError *homeError) //Error is in this line.
{
// do whatever with the data...and errors
if ([homeData length] > 0 && homeError == nil) {
NSError *parseError;
NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:homeData options:0 error:&parseError];
if (responseJSON) {
// the response was JSON and we successfully decoded it
NSLog(@"Response was = %@", responseJSON);
} else {
// the response was not JSON, so let's see what it was so we can diagnose the issue
NSString *homePage = [[NSString alloc] initWithData:homeData encoding:NSUTF8StringEncoding];
NSLog(@"Response was not JSON (from home), it was = %@", homePage);
return homePage;
}
}
else {
NSLog(@"error: %@", homeError);
}
return [NSString stringWithFormat:@"%@", homeData];
}]; }
当我决定我希望我的方法(
requestMainPage)具有返回类型NSData *而不是仅返回void时出现错误。所以我不确定问题出在哪里。
最佳答案
我发现了我的错误，您无法从块内部返回值。
因此，如果我删除了return homeError和return [NSString stringWithFormat:@"%@", homeData];，问题就会消失并且可以编译
关于ios - 中不兼容的 block 指针类型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22574231/