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
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
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