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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；