最近項目有需求, 需要模態(tài)初一個半透明的視圖,就像抖音APP的登錄注冊一樣, 在目標視圖中設置背景顏色然后發(fā)現(xiàn)模態(tài)動作結(jié)束后變成了黑色或者不是半透明的顏色

SecondViewController *seconVC = [[SecondViewController alloc] init];
seconVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;//iOS8之后使用
seconVC.view.alpha = 0.4;
[self.navigationController presentViewController:seconVC animated:YES completion:^{
        
    }];

或者模態(tài)彈出NavigationViewController

SecondViewController *seconVC = [[SecondViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:seconVC];
nav.modalPresentationStyle = UIModalPresentationOverCurrentContext;
seconVC.view.alpha = 0.4;
[self.navigationController presentViewController:nav animated:YES completion:^{
        
}];