我目前正面临这个问题，我需要定义一个动态高度 UITableViewCell。
红线对应于可调整大小的视图（将垂直增长），蓝色标签有 3 个约束：两个用于上面的每个直接红色视图（> = 8），一个具有 170 和较低优先级的超级视图。
绿色的对superview有一个底部约束（5）
当我尝试运行我的代码时，它给了我这个：
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:0x19d65bb0 V:[UIView:0x19d9a9a0(5)]>",
"<NSLayoutConstraint:0x19d667d0 V:[UILabel:0x19de4180(19)]>",
"<NSLayoutConstraint:0x19d5ba70 V:[UILabel:0x19d61870(19)]>",
"<NSLayoutConstraint:0x19d36df0 V:[UILabel:0x19d36e80(19)]>",
"<NSLayoutConstraint:0x19d35d30 V:[UIView:0x19d36130(0)]>",
"<NSLayoutConstraint:0x19e7b310 V:|-(5)-[UILabel:0x19d6b520] (Names: '|':UITableViewCellContentView:0x19d97580 )>",
"<NSLayoutConstraint:0x17d0b060 V:[UILabel:0x19d6b520]-(5)-[UIView:0x19d9a9a0]>",
"<NSLayoutConstraint:0x17d0a480 V:[UIView:0x19d9a9a0]-(8)-[UILabel:0x19de4180]>",
"<NSLayoutConstraint:0x17d0c920 V:[UILabel:0x19de4180]-(8)-[UILabel:0x19d61870]>",
"<NSLayoutConstraint:0x17d0a100 V:[UILabel:0x19d61870]-(8)-[UIView:0x19d839e0]>",
"<NSLayoutConstraint:0x17d11ad0 V:[UIView:0x19d839e0]-(8)-[UILabel:0x19d36e80]>",
"<NSLayoutConstraint:0x19e742a0 V:[UILabel:0x19d36e80]-(8)-[UILabel:0x19d36770]>",
"<NSLayoutConstraint:0x19ed84a0 V:[UILabel:0x19d36770]-(8)-[UIView:0x19d36130]>",
"<NSLayoutConstraint:0x19e76410 V:[UIView:0x19d36130]-(>=8)-[UILabel:0x19d35560]>",
"<NSLayoutConstraint:0x19ed8af0 V:[UILabel:0x19d35560]-(8)-[UITextView:0x1832ba00]>",
"<NSLayoutConstraint:0x19e7abf0 V:[UITextView:0x1832ba00]-(8)-[UILabel:0x19e7d890]>",
"<NSLayoutConstraint:0x19e83d90 V:[UILabel:0x19e7d890]-(8)-[UITextView:0x18a95e00]>",
"<NSLayoutConstraint:0x19e7b520 V:[UITextView:0x18a95e00]-(5)-| (Names: '|':UITableViewCellContentView:0x19d97580 )>",
"<NSAutoresizingMaskLayoutConstraint:0x19d46fc0 h=--& v=--& V:[UITableViewCellContentView:0x19d97580(0)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x19d36df0 V:[UILabel:0x19d36e80(19)]>
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.
所以，问题是：实现这一目标的正确方法是什么？？？