iOS开发之如何给View添加指定位置的边框线详解

前言

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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 <uikit/uikit.h> 
 
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；

总结

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