iOS present AlertController时崩溃。 'Application tried to present modally an active controller <HKConnectViewControll

概述*** Terminating app due to uncaught exception ‘NSInvalidArgumentException‘, reason: ‘Application tried to present modally an active controller <HKConnectViewController: 0x1050158e0>.‘   分析： 很有可能是你的触发事

*** Terminating app due to uncaught exception ‘NSinvalidargumentexception‘,reason: ‘Application trIEd to present modally an active controller <HKConnectVIEwController: 0x1050158e0>.‘

 

分析：

很有可能是你的触发事件中，触发了多次。也就是说：需要不止一次present。

解决办法：

加入单例，保证只执行一次

    static dispatch_once_t oncetoken;    dispatch_once(&oncetoken,^{        [self presentVIEwController:self.bluetoothCloseAlertC animated:YES completion:nil];    });

总结

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