在使用Masonry布局框架時，有時候因為使用不當(dāng)會導(dǎo)致約束沖突，會在控制臺輸出類似這樣的警告

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.
2019-03-12 23:11:35.844573+0800 artDesign[11723:4004040] [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:0x283438000 UILabel:0x102d8a3d0.height == 43.9659>",
    "<MASLayoutConstraint:0x283438360 UILabel:0x102d8a3d0.top == UITableViewCellContentView:0x102d8a1e0.top + 9>",
    "<MASLayoutConstraint:0x283435980 UILabel:0x102fbf420.height == 15>",
    "<MASLayoutConstraint:0x283435b60 UILabel:0x102fbf420.top == UILabel:0x102d8a3d0.bottom + 10>",
    "<MASLayoutConstraint:0x283435c20 UILabel:0x102fbf420.bottom == UITableViewCellContentView:0x102d8a1e0.bottom - 10>",
    "<NSLayoutConstraint:0x283336300 UITableViewCellContentView:0x102d8a1e0.height == 88>"
)

Will attempt to recover by breaking constraint 

這類輸出很煩，少的話可以設(shè)置約束優(yōu)先級來解決，多的話不想解決怎辦？
在網(wǎng)上找到了這個方法http://landcareweb.com/questions/7235/zai-xcodede-diao-shi-kong-zhi-tai-shu-chu-zhong-jin-yong-zi-dong-bu-ju-yue-shu-cuo-wu-xiao-xi

Swift 3

 UserDefaults.standard.setValue(false, forKey: "_UIConstraintBasedLayoutLogUnsatisfiable")

Objective-C

[[NSUserDefaults standardUserDefaults] setValue:@(NO) forKey:@"_UIConstraintBasedLayoutLogUnsatisfiable"];

可以設(shè)置該參數(shù)達(dá)到屏蔽的目的，不過警告能解決就解決吧。