Question

我想用Masonry在导航栏20px下面画一个按钮，所以我使用下面的代码

[button mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.equalTo(self.view.mas_left).with.offset(20);
    make.right.equalTo(self.view.mas_right);
    make.top.equalTo(@(self.topLayoutGuide.length + 20));
    make.height.equalTo(@30);
}];

但它不起作用！除非我像这样更改代码

make.top.equalTo(@84);

所以我不想使用@ 84，还有其他方法吗？谢谢!!

Answer 1

尝试

make.top.equalTo(@(self.navigationController.navigationBar.frame.size.height + 20));

Answer 2

最好使用navigationBar和statusBarFrame属性来获得最高偏移量。

您可以使用以下内容：

CGFloat topbarHeight = ([UIApplication sharedApplication].statusBarFrame.size.height +
                                (self.navigationController.navigationBar.frame.size.height ? : 0.0));

// button
[button mas_makeConstraints:^(MASConstraintMaker* make) {
    make.height.equalTo(@30);
    make.top.equalTo(self.view.mas_top).with.offset(topbarHeight);
    make.left.equalTo(self.view.mas_left).with.offset(20);
    make.right.equalTo(self.view.mas_right);
}];

但最好使用UIKit的layoutGuides：

[topView mas_makeConstraints:^(MASConstraintMaker *make) {
    UIView *topLayoutGuide = (id)self.topLayoutGuide;
    make.top.equalTo(topLayoutGuide.bottom);
    make.left.equalTo(self.view);
    make.right.equalTo(self.view);
    make.height.equalTo(@100);
}];

<强>已更新

但现在已经弃用了:) iOS 11.0及更高版本我们可以使用UIView的safeAreaLayoutGuide属性。

if (@available(iOS 11.0, *)) {
    make.top.equalTo(self.view.mas_safeAreaLayoutGuideTop);
} else {
    UIView *topLayoutGuide = (id)self.topLayoutGuide;
    make.top.equalTo(topLayoutGuide.mas_bottom);
}

如何在导航栏中使用砌体

2 个答案: