iOS 贝塞尔曲线自定义图形.
效果gif图:
举例: 以效果图左上角梯形为例子:
/* 所用宏： #define kViewWidth(View) CGRectGetWidth(View.frame) #define kViewHeight(View) CGRectGetHeight(View.frame) */
// 1、创建按钮 UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom]; btn.frame = CGRectMake(20, 100, 120, 50); btn.backgroundColor = [UIColor orangeColor]; [btn setTitle:@"按钮" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn]; // 2、设置贝塞尔曲线路径
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0.f, 0.f)]; [path addLineToPoint:CGPointMake(kViewWidth(btn), 0.f)]; [path addLineToPoint:CGPointMake(kViewWidth(btn) *3/4, btn.frame.size.height)]; [path addLineToPoint:CGPointMake(0.f, kViewHeight(btn)];
[path closePath];
// 3、绘制图形时添加path遮罩
- (void)drawRect:(CGRect)rect { [super drawRect:rect]; CAShapeLayer *shapLayer = [CAShapeLayer layer]; shapLayer.path = self.path.CGPath; self.layer.mask = shapLayer; } 至此绘制出左上角的梯形,但是如果 只要我们绘制出来的图形能点击,触发手势 要加以下触发手势判断
// 点击的覆盖方法，点击时判断点是否在path内，YES则响应，NO则不响应
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event { BOOL res = [super pointInside:point withEvent:event]; if (res) { if ([self.path containsPoint:point]) { return YES; } return NO; } return NO; }
Done.