iOS中实现上下左右边框的自定义显示

最新推荐文章于 2025-07-19 12:47:50 发布

原创最新推荐文章于 2025-07-19 12:47:50 发布 · 3k 阅读

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#iOS #border #边框 #显示一边

本文介绍如何自定义 UIView 的上下左右边框显示，包括顶部、左侧、底部和右侧，通过枚举类型和方法实现边框的动态调整。

有时候我们需要自定义上下左右边框哪一边或几边显示，现在介绍下我的方法，希望可以为大家提供一种思路。

项目中调用类似：

self.view.borderWhich = ZJViewBorderBottom;

不说那么多，直接上代码。

UIView+additional.h

#import <UIKit/UIKit.h>
typedef NS_ENUM(NSInteger, ZJViewBorder) {
    ZJViewBorderTop = 1<<1,
    ZJViewBorderLeft = 1<<2,
    ZJViewBorderBottom = 1<<3,
    ZJViewBorderRight = 1<<4,
};
@interface UIView (additional)
@property (nonatomic, assign) ZJViewBorder borderWhich;
@end

UIView+additional.m

#import "UIView+additional.h"

@implementation UIView (additional)
@dynamic borderWhich;
- (void)setBorderWhich:(ZJViewBorder)borderWhich {
    CGFloat bh = self.layer.borderWidth;
    
    if (borderWhich & ZJViewBorderBottom) {
        [self addBottomBorder:self borderHeight:bh];
    }
    if (borderWhich & ZJViewBorderLeft) {
        [self addLeftBorder:self borderHeight:bh];
    }
    if (borderWhich & ZJViewBorderRight) {
        [self addRightBorder:self borderHeight:bh];
    }
    if (borderWhich & ZJViewBorderTop) {
        [self addTopBorder:self borderHeight:bh];
    }
    self.layer.borderWidth = 0;
}
- (void)addTopBorder:(UIView *)vi borderHeight:(CGFloat)bh {
    CGColorRef col = vi.layer.borderColor;
    if (vi.layer.borderWidth > 1000 || vi.layer.borderWidth == 0) {
        bh = 1;
    }
    else
        bh = vi.layer.borderWidth;
    CALayer *border = [CALayer layer];
    border.frame = CGRectMake(0, 0, vi.frame.size.width, bh);
    border.backgroundColor = col;
    [vi.layer addSublayer:border];
}
- (void)addLeftBorder:(UIView *)vi borderHeight:(CGFloat)bh{
    CGColorRef col = vi.layer.borderColor;
    if (vi.layer.borderWidth > 1000 || vi.layer.borderWidth == 0) {
        bh = 1;
    }
    else
        bh = vi.layer.borderWidth;
    CALayer *border = [CALayer layer];
    border.frame = CGRectMake(0, 0, bh, vi.frame.size.height);
    border.backgroundColor = col;
    [vi.layer addSublayer:border];
}
- (void)addBottomBorder:(UIView *)vi borderHeight:(CGFloat)bh{
    CGColorRef col = vi.layer.borderColor;
    if (vi.layer.borderWidth > 1000 || vi.layer.borderWidth == 0) {
        bh = 1;
    }
    else
        bh = vi.layer.borderWidth;
    CALayer *border = [CALayer layer];
    border.frame = CGRectMake(0, vi.frame.size.height-bh, vi.frame.size.width, bh);
    border.backgroundColor = col;
    [vi.layer addSublayer:border];
}
- (void)addRightBorder:(UIView *)vi borderHeight:(CGFloat)bh{
    CGColorRef col = vi.layer.borderColor;
    if (vi.layer.borderWidth > 1000 || vi.layer.borderWidth == 0) {
        bh = 1;
    }
    else
        bh = vi.layer.borderWidth;
    CALayer *border = [CALayer layer];
    border.frame = CGRectMake(vi.frame.size.width-bh, 0, bh, vi.frame.size.height);
    border.backgroundColor = col;
    [vi.layer addSublayer:border];
}

@end