这些约束条件为什么不起作用？

Question

我编程设置一个UIView内的三个视图以下限制：

UIView *view1 = ((UIViewController *)[self.viewControllers objectAtIndex:0]).view; 
UIView *view2 = ((UIViewController *)[self.viewControllers objectAtIndex:1]).view; 
UIView *view3 = ((UIViewController *)[self.viewControllers objectAtIndex:2]).view; 

NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(view1, view2, view3); 
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[view1(==320)]-0-[view2(==320)]-0-[view3(==320)]|" options:0 metrics:0 views:viewsDictionary]]; 

我的本意是，每个视图是320像素宽，坐在要紧靠在一个另一个无间隙，并查看一个靠在左包含UIView的边缘。

然而，在编译时，意见是在顶部的一另一种布局和我在控制台下：

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:0x211811c0 H:|-(0)-[UIView:0xc683790] (Names: '|':UIView:0xc683320)>", 
    "<NSAutoresizingMaskLayoutConstraint:0x21179820 h=-&- v=-&- UIView:0xc683790.midX == UIView:0xc683320.midX - 340>", 
    "<NSLayoutConstraint:0x211793d0 H:[UIView:0xc6a50c0]-(0)-| (Names: '|':UIView:0xc683320)>", 
    "<NSLayoutConstraint:0x21179390 H:[UIView:0xc6a50c0(320)]>", 
    "<NSLayoutConstraint:0x21179350 H:[UIView:0xc6a05f0]-(0)-[UIView:0xc6a50c0]>", 
    "<NSLayoutConstraint:0x211563d0 H:[UIView:0xc6a05f0(320)]>", 
    "<NSLayoutConstraint:0x21156390 H:[UIView:0xc683790]-(0)-[UIView:0xc6a05f0]>" 
) 

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x21179350 H:[UIView:0xc6a05f0]-(0)-[UIView:0xc6a50c0]> 

Answer 1

尝试所有的设置

[view setTranslatesAutoresizingMaskIntoConstraints:NO]; 

您意见，它通常足以解决这类问题。