目标C：如何以编程方式在安全区域内创建self.view

目标C：如何以编程方式在安全区域内创建self.view

在Objective-C中尝试此 *** 作，请参见：

UIView * myView = // initialize view using IBOutlet or programticallymyView.backgroundColor = [UIColor redColor];myView.translatesAutoresizingMaskIntoConstraints = NO;if (@available(iOS 11, *)) {    UILayoutGuide * guide = self.view.safeAreaLayoutGuide;    [myView.leadingAnchor constraintEqualToAnchor:guide.leadingAnchor].active = YES;    [myView.trailingAnchor constraintEqualToAnchor:guide.trailingAnchor].active = YES;    [myView.topAnchor constraintEqualToAnchor:guide.topAnchor].active = YES;    [myView.bottomAnchor constraintEqualToAnchor:guide.bottomAnchor].active = YES;} else {    UILayoutGuide *margins = self.view.layoutMarginsGuide;    [myView.leadingAnchor constraintEqualToAnchor:margins.leadingAnchor].active = YES;    [myView.trailingAnchor constraintEqualToAnchor:margins.trailingAnchor].active = YES;    [myView.topAnchor constraintEqualToAnchor:self.topLayoutGuide.bottomAnchor].active = YES;    [myView.bottomAnchor constraintEqualToAnchor:self.bottomLayoutGuide.topAnchor].active = YES;}// Refresh myView and/or main view[self.view layoutIfNeeded];//[self.myView layoutIfNeeded];