如何画一个平行四边形按钮(How to draw a parallelogram button)

我需要绘制平行四边形的形状的自定义按钮。 做这个的最好方式是什么？ 图像的方式（即，以设置控制背景图像）是不适合的。

Answer 1:

如果你不需要设置任何图像按钮由Brain89提供的解决方案是好的。 我的背景和内容的形象，我需要做一个平行四边形按钮，在不改变图像。 我用下面的代码：

// Pass 0..1 value to either skewX if you want to compress along the X axis 
// or skewY if you want to compress along the Y axis
- (void)parallelogramButtonWithButton:(UIButton *)button withSkewX:(CGFloat)skewX withSkewY:(CGFloat)skewY {
    CGAffineTransform affineTransform =  CGAffineTransformConcat(CGAffineTransformIdentity, CGAffineTransformMake(1, skewY, skewX, 1, 0, 0));
    button.layer.affineTransform = affineTransform;
}

Answer 2:

我们希望，这是非常容易的。 一些谷歌搜索后，我想出了解决方案

UIParallelogramButton.h

#import <UIKit/UIKit.h>
#import "QuartzCore/QuartzCore.h"

@interface UIParallelogramButton : UIButton
{
    CGFloat offset;
}
@property CGFloat offset;
@end

UIParallelogramButton.m

#import "UIParallelogramButton.h"

@implementation UIParallelogramButton
@synthesize offset;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        offset = 0.0F;
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    UIBezierPath* maskPath = [UIBezierPath bezierPath];
    [maskPath moveToPoint:CGPointMake(rect.origin.x + offset, rect.origin.y)];
    [maskPath addLineToPoint:CGPointMake(rect.size.width + rect.origin.x, rect.origin.y)];
    [maskPath addLineToPoint:CGPointMake(rect.origin.x + rect.size.width - offset, rect.origin.y + rect.size.height)];
    [maskPath addLineToPoint:CGPointMake(rect.origin.x, rect.origin.y + rect.size.height)];
    [maskPath closePath];
    CAShapeLayer* maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;
    self.layer.mask = maskLayer;
}
@end

文章来源: How to draw a parallelogram button