1.使用斷點(diǎn)工具并不能找出錯誤，最后仔細(xì)看了下報錯信息

2.報錯信息

[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. 
(
    "<NSLayoutConstraint:0x608000098a60 UIView:0x7fcb7b428fe0.height == 50   (active)>",
    "<NSLayoutConstraint:0x608000098060 V:|-(0)-[UIView:0x7fcb7b428fe0]   (active, names: '|':UITableViewCellContentView:0x7fcb7b42bd40 )>",
    "<NSLayoutConstraint:0x608000097b60 V:[UIView:0x7fcb7b42ed00]-(0)-|   (active, names: '|':UITableViewCellContentView:0x7fcb7b42bd40 )>",
    "<NSLayoutConstraint:0x608000097c00 V:[UIView:0x7fcb7b428fe0]-(0)-[UIView:0x7fcb7b42ed00]   (active)>",
    "<NSLayoutConstraint:0x60000009bf80 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fcb7b42bd40.height == 49.5   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x608000098a60 UIView:0x7fcb7b428fe0.height == 50   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

3.分析

 "<NSLayoutConstraint:0x608000098a60 UIView:0x7fcb7b428fe0.height == 50   (active)>",
"<NSLayoutConstraint:0x60000009bf80 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fcb7b42bd40.height == 49.5   (active)>"

第一句代碼信息是視圖中有個界面的高度為50;
第二句中意思是cell_contentView的高度為49.5;

問題就來了

contentView沒有我設(shè)置的自視圖大，而且我對cell設(shè)置了clips to view = YES。
約束就存在了沖突，xcode報錯提示。

把cell的高度調(diào)大或者view的高度調(diào)小解決

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