创建一个类继承自 NSLayoutConstraint
.h
#import <UIKit/UIKit.h>
@interface LJKlayoutConstraint : NSLayoutConstraint
@end
.m
#import "LJKlayoutConstraint.h"
@implementation LJKlayoutConstraint
-(void) awakeFromNib{
[super awakeFromNib];
if(self.constant==1){
self.constant = 1 / [UIScreen mainScreen].scale;
}
}
@end
在XIB或者storyboard中 创建一个uiview设置分割线颜色并且设置layout
![](https://img.haomeiwen.com/i7929400/f084cab3d3cac8c5.png)
双击选中高的约束 然后在右上方选中
![](https://img.haomeiwen.com/i7929400/3319f310cc14567f.png)
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