Question

我总是在代码中创建我的视图，因此从未使用过自动布局（直到现在）。不使用nib的原因是因为我更喜欢代码，并且通过GitHub等进行维护更简单，但足够了。

Alloc＆amp;初始化所有标签
为每个标签添加一个框架（并设置字体，文本颜色等）
将标签添加为子视图

然后我尝试在它们之间设置约束：

NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"[label1]-15-[label2]-15-[label3]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(label1, label2, label3)];
[self addConstraints:constraints]; //Im subclassing an UIView that's why self

但是我收到一个错误说：

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:0x14c14110 H:[UILabel:0x14c12ab0]-(15)-[UILabel:0x14c12f80]>",
    "<NSAutoresizingMaskLayoutConstraint:0x14c08b00 h=--& v=--& UILabel:0x14c12ab0.midX == + 195>",
    "<NSAutoresizingMaskLayoutConstraint:0x14c0dd90 h=--& v=--& H:[UILabel:0x14c12ab0(40)]>",
    "<NSAutoresizingMaskLayoutConstraint:0x14c1c170 h=--& v=--& UILabel:0x14c12f80.midX == + 237.5>",
    "<NSAutoresizingMaskLayoutConstraint:0x14c12f00 h=--& v=--& H:[UILabel:0x14c12f80(40)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x14c14110 H:[UILabel:0x14c12ab0]-(15)-[UILabel:0x14c12f80]>

即使我尝试在标签2和3上这样做，也会发生同样的事情。我不完全理解NSLog的说法。

非常感谢任何帮助。此外，如果你有什么好的链接去哪里解码＆＃34;那些h=--& v=--& UILabel:0x14c12f80.midX == + 237.5事情会很棒。

Answer 1

h=和v=是自动调整掩码被转换为约束的签名。您是否忘了在其中一个观点上设置translatesAutoResizingMasksToConstraints = NO？

自动布局无法同时满足约束

1 个答案: