ios 自頂一個view

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////  YKPopView.m//  DrawAnSample////  Created by 高順生 on 15/9/6.//  Copyright (c) 2015年 yinyakun. All rights reserved.//#import "YKPopView.h"#define MENUGAP 7@implementation YKPopView-(instancetype)initWithFrame:(CGRect)frame {    self = [super initWithFrame:frame];    if (self) {        self.backgroundColor = [UIColor clearColor];    }    return self;}// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect {    // Drawing code    CGFloat width = rect.size.width;    CGFloat height = rect.size.height;    CGFloat radius = 3;        // 擷取CGContext，注意UIKit裡用的是一個專門的函數    CGContextRef context = UIGraphicsGetCurrentContext();    // 移動到初始點    CGContextMoveToPoint(context, radius, MENUGAP);        // 繪製第1條線和第1個1/4圓弧    CGContextAddLineToPoint(context, width * 5/6 - 6,MENUGAP);    CGContextAddLineToPoint(context, width * 5/6,0);    CGContextAddLineToPoint(context, width  * 5/6 + 6,MENUGAP);    CGContextAddLineToPoint(context, width - radius, MENUGAP);    CGContextAddArc(context, width - radius, radius + MENUGAP, radius, -0.5 * M_PI, 0.0, 0);        // 繪製第2條線和第2個1/4圓弧    CGContextAddLineToPoint(context, width, height - radius - MENUGAP);    CGContextAddArc(context, width - radius, height - radius - MENUGAP, radius, 0.0, 0.5 * M_PI, 0);        // 繪製第3條線和第3個1/4圓弧    CGContextAddLineToPoint(context, radius, height - MENUGAP);    CGContextAddArc(context, radius, height - radius - MENUGAP, radius, 0.5 * M_PI, M_PI, 0);        // 繪製第4條線和第4個1/4圓弧    CGContextAddLineToPoint(context, 0, radius + MENUGAP);    CGContextAddArc(context, radius, radius + MENUGAP, radius, M_PI, 1.5 * M_PI, 0);        // 閉合路徑    CGContextClosePath(context);        [[UIColor redColor] setFill];    CGContextDrawPath(context, kCGPathFill);}

　　自訂一個view.

ios 自頂一個view