不使用图像的自定义 UIButton 形状 [英] Custom UIButton Shape without using an image

问题描述

我想制作一个看起来类似于 UIBackBarButtonItem 的 UIButton(箭头指向左侧的导航堆栈.如果可能的话，我宁愿这样做而不必使用图像，因为按钮的大小会有所不同，具体取决于在手机的方向上.

I want to make a UIButton with that looks similar to the UIBackBarButtonItem (with an arrow pointing left for the navigation stack. I would prefer to do this without having to use an image if possible because the button will have a different size depending on the phone's orientation.

有没有办法在代码中激活这种影响?我的想法是以某种方式使用按钮的 CALayer.

Is there a way to active this affect in code? My idea was using the CALayer of the button somehow.

谢谢！

编辑

我正在尝试使用@Deepak 的建议，但遇到了问题.我希望按钮的右侧看起来像 [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:4] 左侧看起来像箭头.我尝试使用 addQuadCurveToPoint:controlPoint 方法来做到这一点.

I am trying to use @Deepak's advice, but I am running into a a problem. I want the right side of the button to look like a [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:4] with the left side looking like an arrow. I tried to do this using the addQuadCurveToPoint:controlPoint method.

我使用矩形的角作为控制点，但路径没有像我预期的那样弯曲.它仍然像我只使用 addLineToPoint: 方法一样走投无路.我的代码如下.

I am using the corner of the rect as the control point, but the path does not curve like I expect. It is still cornered as if I only used the addLineToPoint: method. My code is below.

float radius = 4.0;
UIBezierPath *path = [UIBezierPath bezierPath];

CGPoint startPoint = CGPointMake(rect.size.width/5.0, 0);
CGPoint pointBeforeTopCurve = CGPointMake(rect.size.width - radius, 0);
CGPoint topRightCorner = CGPointMake(rect.size.width, 0);
CGPoint pointAfterTopCurve = CGPointMake(rect.size.width, 0.0-radius);

CGPoint pointBeforeBottomCurve = CGPointMake(rect.size.width, rect.size.height-radius);
CGPoint bottomRightCorner = CGPointMake(rect.size.width, rect.size.height);
CGPoint pointAfterBottomCurve = CGPointMake(rect.size.width - radius, rect.size.height);

CGPoint pointBeforeArrow = CGPointMake(rect.size.width/5.0, rect.size.height);
CGPoint arrowPoint = CGPointMake(0, rect.size.height/2.0);


[path moveToPoint:pointBeforeTopCurve];
[path addQuadCurveToPoint:pointAfterTopCurve controlPoint:topRightCorner];

[path addLineToPoint:pointBeforeBottomCurve];
[path addQuadCurveToPoint:pointAfterBottomCurve controlPoint:bottomRightCorner];


[path addLineToPoint:pointBeforeArrow];
[path addLineToPoint:arrowPoint];
[path addLineToPoint:startPoint];

推荐答案

你可以用 Quartz.您将需要子类 UIButton 并实现其 drawRect: 方法.您将必须定义一个路径并用渐变填充它.

You can do this with Quartz. You will need subclass UIButton and implement its drawRect: method. You will have to define a path and fill it with a gradient.

您还必须实现 hitTest:withEvent:，因为它涉及非矩形形状.

You will also have to implement hitTest:withEvent: as it involves non-rectangular shape.

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