本文主要给大家介绍了关于iOS如何给View添加指定位置边框线的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。
略微封装了一下，给View添加指定位置的边框线，其中位移枚举的使用询问了哥们儿，总算搞定；
示例代码
封装一：直接封装成了一个方法
/// 边框类型(位移枚举)
typedef NS_ENUM(NSInteger, UIBorderSideType) {
UIBorderSideTypeAll = 0,
UIBorderSideTypeTop = 1 << 0,
UIBorderSideTypeBottom = 1 << 1,
UIBorderSideTypeLeft = 1 << 2,
UIBorderSideTypeRight = 1 << 3,
};
/**
设置view指定位置的边框
@param originalView 原view
@param color 边框颜色
@param borderWidth 边框宽度
@param borderType 边框类型 例子: UIBorderSideTypeTop|UIBorderSideTypeBottom
@return view
*/
- (UIView *)borderForView:(UIView *)originalView color:(UIColor *)color borderWidth:(CGFloat)borderWidth borderType:(UIBorderSideType)borderType {
if (borderType == UIBorderSideTypeAll) {
originalView.layer.borderWidth = borderWidth;
originalView.layer.borderColor = color.CGColor;
return originalView;
}
/// 线的路径
UIBezierPath * bezierPath = [UIBezierPath bezierPath];
/// 左侧
if (borderType & UIBorderSideTypeLeft) {
/// 左侧线路径
[bezierPath moveToPoint:CGPointMake(0.0f, originalView.frame.size.height)];
[bezierPath addLineToPoint:CGPointMake(0.0f, 0.0f)];
}
/// 右侧
if (borderType & UIBorderSideTypeRight) {
/// 右侧线路径
[bezierPath moveToPoint:CGPointMake(originalView.frame.size.width, 0.0f)];
[bezierPath addLineToPoint:CGPointMake( originalView.frame.size.width, originalView.frame.size.height)];
}
/// top
if (borderType & UIBorderSideTypeTop) {
/// top线路径
[bezierPath moveToPoint:CGPointMake(0.0f, 0.0f)];
[bezierPath addLineToPoint:CGPointMake(originalView.frame.size.width, 0.0f)];
}
/// bottom
if (borderType & UIBorderSideTypeBottom) {
/// bottom线路径
[bezierPath moveToPoint:CGPointMake(0.0f, originalView.frame.size.height)];
[bezierPath addLineToPoint:CGPointMake( originalView.frame.size.width, originalView.frame.size.height)];
}
CAShapeLayer * shapeLayer = [CAShapeLayer layer];
shapeLayer.strokeColor = color.CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
/// 添加路径
shapeLayer.path = bezierPath.CGPath;
/// 线宽度
shapeLayer.lineWidth = borderWidth;
[originalView.layer addSublayer:shapeLayer];
return originalView;
}
封装二：封装成了类别
.h内容
#import typedef NS_OPTIONS(NSUInteger, UIBorderSideType) {
UIBorderSideTypeAll = 0,
UIBorderSideTypeTop = 1 << 0,
UIBorderSideTypeBottom = 1 << 1,
UIBorderSideTypeLeft = 1 << 2,
UIBorderSideTypeRight = 1 << 3,
};
@interface UIView (BorderLine)
- (UIView *)borderForColor:(UIColor *)color borderWidth:(CGFloat)borderWidth borderType:(UIBorderSideType)borderType;
@end
.m内容
#import "UIView+BorderLine.h"
@implementation UIView (BorderLine)
- (UIView *)borderForColor:(UIColor *)color borderWidth:(CGFloat)borderWidth borderType:(UIBorderSideType)borderType {
if (borderType == UIBorderSideTypeAll) {
self.layer.borderWidth = borderWidth;
self.layer.borderColor = color.CGColor;
return self;
}
/// 左侧
if (borderType & UIBorderSideTypeLeft) {
/// 左侧线路径
[self.layer addSublayer:[self addLineOriginPoint:CGPointMake(0.f, 0.f) toPoint:CGPointMake(0.0f, self.frame.size.height) color:color borderWidth:borderWidth]];
}
/// 右侧
if (borderType & UIBorderSideTypeRight) {
/// 右侧线路径
[self.layer addSublayer:[self addLineOriginPoint:CGPointMake(self.frame.size.width, 0.0f) toPoint:CGPointMake( self.frame.size.width, self.frame.size.height) color:color borderWidth:borderWidth]];
}
/// top
if (borderType & UIBorderSideTypeTop) {
/// top线路径
[self.layer addSublayer:[self addLineOriginPoint:CGPointMake(0.0f, 0.0f) toPoint:CGPointMake(self.frame.size.width, 0.0f) color:color borderWidth:borderWidth]];
}
/// bottom
if (borderType & UIBorderSideTypeBottom) {
/// bottom线路径
[self.layer addSublayer:[self addLineOriginPoint:CGPointMake(0.0f, self.frame.size.height) toPoint:CGPointMake( self.frame.size.width, self.frame.size.height) color:color borderWidth:borderWidth]];
}
return self;
}
- (CAShapeLayer *)addLineOriginPoint:(CGPoint)p0 toPoint:(CGPoint)p1 color:(UIColor *)color borderWidth:(CGFloat)borderWidth {
/// 线的路径
UIBezierPath * bezierPath = [UIBezierPath bezierPath];
[bezierPath moveToPoint:p0];
[bezierPath addLineToPoint:p1];
CAShapeLayer * shapeLayer = [CAShapeLayer layer];
shapeLayer.strokeColor = color.CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
/// 添加路径
shapeLayer.path = bezierPath.CGPath;
/// 线宽度
shapeLayer.lineWidth = borderWidth;
return shapeLayer;
}
@end
用法：
UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(80.0f, 80.0f, 200.0f, 100.0f)];
testView.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:testView];
[self borderForView:testView color:[UIColor redColor] borderWidth:1.0f borderType:UIBorderSideTypeTop | UIBorderSideTypeBottom];
效果：
不足之处,边框线过宽的话，交界处会有留白；
ps:注意：需要先把你的view加载在父view上，[self.view addSubview:testView]; 之后再设置边框；否则可能会不起作用的；
