目标C：如何以编程方式在Safe Area中创建self.view

问题描述

限时删除！！

我刚刚将我的应用从支持iOS 8改为支持iOS 9及更高版本。

由于我没有使用故事板来创建我的观点，我想知道是否有编程方式的使用安全区指南选项像那样。

我试图锚定我的观点，但他们不断重叠顶部&在iPhone X模拟器的底部。

解决方案

在Objective-C中试一试，看看：

  UIView * myView = //使用IBOutlet初始化视图或编程
 
 myView.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; 
}其他{
 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; 
 
} 
 
 //刷新myView和/或主视图
 [self.view layoutIfNeeded]; 
 // [self.myView layoutIfNeeded]; 
  

参考：

I have just changed my app from supporting iOS 8 and up to supporting iOS 9 and up.

Since I don't use storyboards to create my views, I was wondering if there's the "Use Safe Area Guides" option programmatically or something like that.

I've tried to anchor my view but they keep overlapping the top & bottom in the iPhone X simulator.

解决方案

Try this in Objective-C and see:

UIView * myView = // initialize view using IBOutlet or programtically

myView.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];

Ref from: Use Safe Area Layout programmatically - Swift

Result:

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