UIImageView无法使用AutoLayout在UITableiViewCell中自动调整大小

Question

下面的调试信息列表：

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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x170c5d50 V:[UIImageView:0x170c5ca0(87)]>",
    "<NSLayoutConstraint:0x170c5f70 UIImageView:0x170c5b60.top == UIImageView:0x170c5900.top>",
    "<NSLayoutConstraint:0x170c6000 UIImageView:0x170c5ca0.top == UIImageView:0x170c5b60.top + 10>",
    "<NSLayoutConstraint:0x170c6030 V:[UIImageView:0x170c5ca0]-(18)-|   (Names: '|':UITableViewCellContentView:0x170c5400 )>",
    "<NSLayoutConstraint:0x170c60f0 V:|-(15)-[UIImageView:0x170c5900]   (Names: '|':UITableViewCellContentView:0x170c5400 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x170c6bd0 h=--& v=--& V:[UITableViewCellContentView:0x170c5400(131)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170c5d50 V:[UIImageView:0x170c5ca0(87)]>

Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

我正在做聊天功能。外部ImageView是背景，内部是用户发送的聊天图像。内部从四个侧面固定到外部，并固定到底部的contentView，用于自动调整单元格。同时，在故事板中设置其宽度和高度约束以及内在的imageview模式是aspectfit。这是条件：

我的问题是调试日志表示高度无法应用，为什么？在Autolayout中无法修改UIImageView的高度？非常感谢，感谢您的申请。