ios 单例

+(DeviceDelegateHelper*)sharedInstance;

+(DeviceDelegateHelper*)sharedInstance{
    static DeviceDelegateHelper *devicedelegatehelper;
    static dispatch_once_t devicedelegatehelperonce;
    dispatch_once(&devicedelegatehelperonce, ^{
        devicedelegatehelper = [[DeviceDelegateHelper alloc] init];
    });
    return devicedelegatehelper;
}