pod 'SJLoadingView'
_loadingView = [SJLoadingView new];
_loadingView.lineColor = [UIColor whiteColor];
_loadingView.bounds = CGRectMake(0, 0, 50, 50);
_loadingView.center = self.view.center;
_loadingView.speed = 1;
[self.view addSubview:_loadingView];