ios 自定义0.5的线条UIView

来源：互联网发布：知乎宋慈编辑：程序博客网时间：2024/05/01 17:41

这是本人第一次写有关ios的博客，也不知道要写什么内容，所以先把自己随手弄的一个自定义View给搞上来，大家觉得好用的话也可以拿去用，后期我再优化一下，感觉在布局那块还是蛮好用的，当然，如果你们这群大神有更好的用法请通知我，我刚涉及ios不久。

在ios xib布局文件中，用自动布局约束的时候，UIView的宽和高最小只能设置1，而不能设置0.5之类的，然后在运行的时候会发现线条太粗，影响整体美观。

一般出现这种问题的时候我都会选择自己定义一条线条，然后就在项目上通用，如果是代码生成的UIView当线条的话，自然可以生成0.5宽高的线条，但是在自动布局约束的时候就没办法了，所以我基于约束布局的情况下定义的线条。

这里最重要的是在代码实现xib布局中的约束条件，针对约束这一块，我到时候会另外总结一篇文章出来，然后下面我就直接贴代码了，可以直接用，还封装得不是很好。具体我今天优化了一下，把上一次遗留的三个问题都解决了，然后用起来更加方便了

这里写图片描述

LineView.h

////  LineView.h//  cafe////  Created by xihao on 17/1/13.//  Copyright © 2017年 yidont. All rights reserved.//#import <UIKit/UIKit.h>@interface LineView : UIView//@property (nonatomic) BOOL isVertical;@property (strong,nonatomic)IBOutlet NSString* key_direction;@property (strong,nonatomic)IBOutlet UIColor * key_color;//设置线条颜色-(void)setLineColor:(UIColor*)color;@end

LineView.m

////  LineView.m//  cafe////  Created by xihao on 17/1/13.//  Copyright © 2017年 yidont. All rights reserved.//#import "LineView.h"#define LINE_COLOR [UIColor colorWithRed:220/255.0f green:220/255.0f blue:220/255.0f alpha:1.0] //线条颜色@implementation LineView{    BOOL isVertical;    UIView* lineV;}-(void)awakeFromNib{    [super awakeFromNib];    [self initView];}-(void)initView{    NSLog(@"线条方向==%@",self.key_direction);    CGRect frame=self.frame;    NSLog(@"line_h=%i,w=%i,ww=%i",(int)frame.size.height,(int)frame.size.width,(int)SCREEN_W);    NSArray* array=self.constraints;    for(NSLayoutConstraint* constraint in array){        if (constraint.firstAttribute == NSLayoutAttributeHeight) {            isVertical=false;        }        if (constraint.firstAttribute == NSLayoutAttributeWidth) {            isVertical=true;        }    }    lineV=[[UIView alloc]init];    lineV.translatesAutoresizingMaskIntoConstraints = NO;    [self addSubview:lineV];    if (isVertical) {        NSLayoutConstraint *top=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:0];        top.active=YES;        NSLayoutConstraint *bottom=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:0];        bottom.active=YES;        NSLayoutConstraint *width=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeWidth multiplier:1 constant:0.5f];        width.active=YES;        if ([self.key_direction isEqualToString:@"left"]) {            NSLayoutConstraint *leading=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeading multiplier:1 constant:0];            leading.active=YES;        }else if([self.key_direction isEqualToString:@"right"]){            NSLayoutConstraint *trailing=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTrailing multiplier:1 constant:0];            trailing.active=YES;        }else{            NSLayoutConstraint *centerX=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];            centerX.active=YES;        }    }else{        NSLayoutConstraint *leading=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeading multiplier:1 constant:0];        leading.active=YES;        NSLayoutConstraint *trailing=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTrailing multiplier:1 constant:0];        trailing.active=YES;        NSLayoutConstraint *height=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1 constant:0.5f];        height.active=YES;        if ([self.key_direction isEqualToString:@"top"]) {            NSLayoutConstraint *top=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:0];            top.active=YES;        }else if([self.key_direction isEqualToString:@"bottom"]){            NSLayoutConstraint *bottom=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:0];            bottom.active=YES;        }else{            NSLayoutConstraint *centerY=[NSLayoutConstraint constraintWithItem:lineV attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];            centerY.active=YES;        }    }    if (self.key_color!=nil) {        [lineV setBackgroundColor:self.key_color];    }else{        [lineV setBackgroundColor:LINE_COLOR];    }}-(void)setLineColor:(UIColor *)color{    [lineV setBackgroundColor:color];}@end

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