iOS：在segue中無法同時滿足約束

Question

我試圖從一個tableview到一個UIViewController做一個segue，但我得到一個奇怪的錯誤。 即使目標視圖完全為空，也會發生錯誤，只是添加到故事板。 我的想法是發送視圖的一些元素是觸發錯誤，但我很困惑，為什么這只是在退出TableViewController時顯示，而不是在最初加載時。

這是堆棧跟蹤形式的錯誤：

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.
2014-10-14 00:52:23.472 Phood[54950:70b] 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:0x9d56270 H:[PHStarsView:0x9d9c4a0(70)]>",
    "<NSLayoutConstraint:0xf544940 H:|-(20)-[PHStarsView:0x9d9c4a0]   (Names: '|':UITableViewCellContentView:0x9fcd710 )>",
    "<NSLayoutConstraint:0xf543d90 H:[PHStarsView:0x9d9c4a0]-(80)-|   (Names: '|':UITableViewCellContentView:0x9fcd710 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x9d774e0 h=--& v=--& H:[UITableViewCellContentView:0x9fcd710(320)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x9d56270 H:[PHStarsView:0x9d9c4a0(70)]>

Answer 1

我使用自定義UITableViewCell筆尖遇到了同樣的問題。 關於解除分配細胞的問題打破了限制。

嘗試添加

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return UITableViewAutomaticDimension;
}

Answer 2

您正在為視圖添加約束，但您已在單元格的contentView上將translatesAutoresizingMaskIntoConstraints設置為YES 。 將其設置為NO - 您顯然希望控制您的約束而不使用iOS的默認值。