标签：temp 布局 method col ble center sed 直接 中间
练习UI布局
masonry 把下划线View移动左边。
开始时对齐中间的 lable ，点击时移动到对应lable下面。
使用方法：
[indicator mas_updateConstraints:^(MASConstraintMaker *make) {
make.centerX.equalTo(curCurTab);
}];
直接报错：
[LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don‘t want. Try this: (1) look at each constraint and try to figure out which you don‘t expect; (2) find the code that added the unwanted constraint or constraints and fix it. ( "<MASLayoutConstraint:0x600002860660 UILabel:0x7feeda8202e0.width == 60>", "<MASLayoutConstraint:0x600002860060 UILabel:0x7feeda820070.width == 60>", "<MASLayoutConstraint:0x600002860840 UILabel:0x7feeda820070.right == UILabel:0x7feeda8202e0.left>", "<MASLayoutConstraint:0x600002860cc0 UIView:0x7feeda820f10.centerX == UILabel:0x7feeda8202e0.centerX>", "<MASLayoutConstraint:0x600002845560 UIView:0x7feeda820f10.centerX == UILabel:0x7feeda820070.centerX>" ) Will attempt to recover by breaking constraint <MASLayoutConstraint:0x600002860660 UILabel:0x7feeda8202e0.width == 60> Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. 2020-01-13 17:08:47.697034+0800 UITabBarControllerTest[62772:3586985] [LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don‘t want. Try this: (1) look at each constraint and try to figure out which you don‘t expect; (2) find the code that added the unwanted constraint or constraints and fix it. ( "<MASLayoutConstraint:0x600002860060 UILabel:0x7feeda820070.width == 60>", "<MASLayoutConstraint:0x600002860840 UILabel:0x7feeda820070.right == UILabel:0x7feeda8202e0.left>", "<MASLayoutConstraint:0x600002860cc0 UIView:0x7feeda820f10.centerX == UILabel:0x7feeda8202e0.centerX>", "<MASLayoutConstraint:0x600002845560 UIView:0x7feeda820f10.centerX == UILabel:0x7feeda820070.centerX>" )
原因:
参考这个https://blog.csdn.net/captainjackNO1/article/details/51275161
mas_updateConstraints方法里对同一个布局的理解就是相对的元素也是一致才行，即这里这样做才算一次update
A->B A->B的变化
A->C 是一个新的约束
或者
使用：
mas_remakeConstraints 重做约束。
[indicator mas_remakeConstraints:^(MASConstraintMaker *make) { make.centerX.equalTo(curCurTab); make.bottom.equalTo(tabLayout.mas_bottom).offset(-2); make.height.equalTo(@3); make.width.equalTo(@15); }];
标签：temp 布局 method col ble center sed 直接 中间
原文地址：https://www.cnblogs.com/mamamia/p/12188241.html
