Question

在Auto Layout的帮助下，我以编程方式实现了视图，以处理iPhone 4,5和6的不同设计布局。该程序在除UITableView之外的所有视图中都很有效。我在控制台中遇到了以下限制问题。

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:0x178be740 V:|-(0)-[UILabel:0x165413b0]   (Names: '|':UITableViewCellContentView:0x16541ac0 )>",
 "<NSLayoutConstraint:0x178b5910 V:[UILabel:0x165413b0(40)]>",
 "<NSLayoutConstraint:0x178a0ac0 V:[UILabel:0x165413b0]-(NSSpace(8))-[UIView:0x1789e5d0]>",
 "<NSLayoutConstraint:0x178a0af0 V:[UIView:0x1789e5d0(1)]>",
 "<NSLayoutConstraint:0x178a0b20 V:[UIView:0x1789e5d0]-(0)-|   (Names: '|':UITableViewCellContentView:0x16541ac0 )>",
 "<NSLayoutConstraint:0x178ab4f0 V:|-(10.5)-[UIImageView:0x1789e4c0]   (Names: '|':UITableViewCellContentView:0x16541ac0 )>",
 "<NSLayoutConstraint:0x178b9ca0 V:[UIImageView:0x1789e4c0(19)]>",
 "<NSLayoutConstraint:0x178b9cd0 V:[UIImageView:0x1789e4c0]-(10.5)-|   (Names: '|':UITableViewCellContentView:0x16541ac0 )>"
)

我尝试了几个帖子，但未能摆脱限制。可以有人建议吗？

更新了代码

//MyCustomeListCell.h
UILabel *listTitle;
UIImageView *listImage;
UIView *listSplitter;

//MyCustomListCell.m
 NSDictionary *viewsDictionary =@{@"listTitle": self.listTitle,@"listImage" : self.listImage,@"listSplitter": self.listSplitter};
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[listTitle(40)]-[listSplitter(1)]|" options:0 metrics:nil views:viewsDictionary]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[listSplitter]|" options:0 metrics:nil views:viewsDictionary]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10.5-[listImage(19)]-10.5-|" options:0 metrics:nil views:viewsDictionary]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-15-[listTitle]-15-[listImage(13)]-20-|" options:0 metrics:nil views:viewsDictionary]];

Answer 1

此格式字符串，＆＃34; V：| -10.5- [listImage（19）] - 10.5- |＆＃34;是说你希望imageView与其超视图的顶部和底部分开10.5点，但也要高19点。因此，除非superview在所有屏幕尺寸中都高出40个点，否则会导致错误。

与此相同，＆＃34; V：| [listTitle（40）] - [listSplitter（1）] |＆＃34;只有当超级视图高49点（短跑40 + 8（我认为）+ 1）时，这个才有效。

要解决这些问题，您需要不要让系统受到限制。根据您的需要，您可以删除＆＃34; |＆＃34;从这些格式字符串的一端，或摆脱大小设置。

Answer 2

有更简单的方法，不使用约束，但autoresizingMask：

self.autoresizingMask = UIViewAutoresizingFlexibleWidth;

UITableView中的自动布局约束问题

2 个答案: