关于_WebTryThreadLock , tried to obtain the web lock from a thread other than the main thread or the w

利用web界面操做iDevice时,在处理Web请求的方法web

-(void)calloutHandler {

    NSString *telNum = @"123456";

    AppDelegate *appdelegate = [[UIApplication sharedApplication] delegate];

    InitialViewControler *initialViewController = (InitialViewController *)appDelegate.window.rootViewController;

    initialViewController.telNum = telNum;

    [initialViewController callout];
}

InitialViewController中的处理方法app

- (void)callout {

    NSURL *phoneURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel://%@", self.telNum];

    UIWebView *phoneCallWebView = [[UIWebView alloc] init];

    [phoneCallWebView loadRequest:[NSURLRequest requestWithURL:phoneURL]];

    [self.view addSubview:phoneCallWebView];
}

问题来了,使用UIWe不View处理打电话这个动做是为了电话结束的时候可以返回应用界面,同时又没有使用网上说的那个可能会上不了AppStore的方法(没试过)。关于代码打电话能够看这篇文章。若是使用这种方法,在UIWebView *phoneCallWebView = [[UIWebView alloc] init]这句就跑不动了,报tried to obtain the web lock from a thread other than the main thread or the web thread. UIKit should not be called from a secondary threadbalabala。大致意思就是操做UIKit必须在主线程上。因此咱们使用GCD把UIWebView *phoneCallWebView = [[UIWebView alloc] init] 提到主线程上来,方法以下async

- (void)callout {

    NSURL *phoneURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel://%@", self.telNum];

    dispatch_async(dispatch_get_main_queue(), ^{

        UIWebView *phoneCallWebView = [[UIWebView alloc] init];

        [phoneCallWebView loadRequest:[NSURLRequest requestWithURL:phoneURL]];

        [self.view addSubview:phoneCallWebView];
    }
}

就能够了。不想用或者用不了GCD的,能够参考这篇文章spa

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