我有一个关于UIButton及其命中区域的问题。我在界面构建器中使用“信息暗”按钮，但是发现命中区域不足以容纳某些人的手指。

有没有一种方法可以通过编程方式或在Interface Builder中增加按钮的点击区域，而无需更改InfoButton图形的大小？

由于我使用的是背景图片，因此这些解决方案都不适合我。这是一个执行一些有趣的Objective-C魔术的解决方案，并以最少的代码提供了一个解决方案。

首先，向其中添加一个UIButton覆盖命中测试的类别，还添加一个用于扩展命中测试框架的属性。

UIButton + Extensions.h

@interface UIButton (Extensions)

@property(nonatomic, assign) UIEdgeInsets hitTestEdgeInsets;

@end

UIButton + Extensions.m

#import "UIButton+Extensions.h"
#import <objc/runtime.h>

@implementation UIButton (Extensions)

@dynamic hitTestEdgeInsets;

static const NSString *KEY_HIT_TEST_EDGE_INSETS = @"HitTestEdgeInsets";

-(void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets {
    NSValue *value = [NSValue value:&hitTestEdgeInsets withObjCType:@encode(UIEdgeInsets)];
    objc_setAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

-(UIEdgeInsets)hitTestEdgeInsets {
    NSValue *value = objc_getAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS);
    if(value) {
        UIEdgeInsets edgeInsets; [value getValue:&edgeInsets]; return edgeInsets;
    }else {
        return UIEdgeInsetsZero;
    }
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    if(UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero) || !self.enabled || self.hidden) {
        return [super pointInside:point withEvent:event];
    }

    CGRect relativeFrame = self.bounds;
    CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitTestEdgeInsets);

    return CGRectContainsPoint(hitFrame, point);
}

@end

添加此类后，您所需要做的就是设置按钮的边缘插图。请注意，我选择添加插图，因此如果要增大点击区域，则必须使用负数。

[button setHitTestEdgeInsets:UIEdgeInsetsMake(-10, -10, -10, -10)];

注意：请记住在类别中导入类别（#import "UIButton+Extensions.h"）。

只需在界面生成器中设置图像边缘插入值即可。

这是在Swift中使用扩展的优雅解决方案。根据Apple的人机界面指南（https://developer.apple.com/ios/human-interface-guidelines/visual-design/layout/），它使所有UIButton的命中面积至少为44x44点

斯威夫特2：

private let minimumHitArea = CGSizeMake(44, 44)

extension UIButton {
    public override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
        // if the button is hidden/disabled/transparent it can't be hit
        if self.hidden || !self.userInteractionEnabled || self.alpha < 0.01 { return nil }

        // increase the hit frame to be at least as big as `minimumHitArea`
        let buttonSize = self.bounds.size
        let widthToAdd = max(minimumHitArea.width - buttonSize.width, 0)
        let heightToAdd = max(minimumHitArea.height - buttonSize.height, 0)
        let largerFrame = CGRectInset(self.bounds, -widthToAdd / 2, -heightToAdd / 2)

        // perform hit test on larger frame
        return (CGRectContainsPoint(largerFrame, point)) ? self : nil
    }
}

斯威夫特3：

fileprivate let minimumHitArea = CGSize(width: 100, height: 100)

extension UIButton {
    open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        // if the button is hidden/disabled/transparent it can't be hit
        if self.isHidden || !self.isUserInteractionEnabled || self.alpha < 0.01 { return nil }

        // increase the hit frame to be at least as big as `minimumHitArea`
        let buttonSize = self.bounds.size
        let widthToAdd = max(minimumHitArea.width - buttonSize.width, 0)
        let heightToAdd = max(minimumHitArea.height - buttonSize.height, 0)
        let largerFrame = self.bounds.insetBy(dx: -widthToAdd / 2, dy: -heightToAdd / 2)

        // perform hit test on larger frame
        return (largerFrame.contains(point)) ? self : nil
    }
}

您还可以继承子类UIButton或自定义，UIView并point(inside:with:)使用类似以下内容的值进行覆盖：

迅捷3

override func point(inside point: CGPoint, with _: UIEvent?) -> Bool {
    let margin: CGFloat = 5
    let area = self.bounds.insetBy(dx: -margin, dy: -margin)
    return area.contains(point)
}

物镜

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    CGFloat margin = 5.0;
    CGRect area = CGRectInset(self.bounds, -margin, -margin);
    return CGRectContainsPoint(area, point);
}

这是Swift 3.0中Chase的UIButton + Extensions。

import UIKit

private var pTouchAreaEdgeInsets: UIEdgeInsets = .zero

extension UIButton {

    var touchAreaEdgeInsets: UIEdgeInsets {
        get {
            if let value = objc_getAssociatedObject(self, &pTouchAreaEdgeInsets) as? NSValue {
                var edgeInsets: UIEdgeInsets = .zero
                value.getValue(&edgeInsets)
                return edgeInsets
            }
            else {
                return .zero
            }
        }
        set(newValue) {
            var newValueCopy = newValue
            let objCType = NSValue(uiEdgeInsets: .zero).objCType
            let value = NSValue(&newValueCopy, withObjCType: objCType)
            objc_setAssociatedObject(self, &pTouchAreaEdgeInsets, value, .OBJC_ASSOCIATION_RETAIN)
        }
    }

    open override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        if UIEdgeInsetsEqualToEdgeInsets(self.touchAreaEdgeInsets, .zero) || !self.isEnabled || self.isHidden {
            return super.point(inside: point, with: event)
        }

        let relativeFrame = self.bounds
        let hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.touchAreaEdgeInsets)

        return hitFrame.contains(point)
    }
}

要使用它，您可以：

button.touchAreaEdgeInsets = UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)

我建议将UIButton的类型为Custom放置在信息按钮的中心。将自定义按钮的大小调整为所需的点击区域大小。从那里有两个选择：

1. 选中自定义按钮的“突出显示高亮显示”选项。白色发光会出现在“信息”按钮上方，但是在大多数情况下，用户的手指会遮住该发光，并且他们所看到的只是周围的发光。

2. 为信息按钮设置一个IBOutlet，为自定义按钮设置两个IBAction，一个用于“ Touch Down”，一个用于“ Touch Up Inside”。然后在Xcode中，使触地事件将信息按钮的突出显示属性设置为“是”，而触库事件将其高亮显示属性设置为“否”。

不要backgroundImage用您的图像设置属性，而是设置imageView属性。另外，请确保已将imageView.contentMode设置为UIViewContentModeCenter。

我对Swift 3的解决方案：

class MyButton: UIButton {

    override open func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let relativeFrame = self.bounds
        let hitTestEdgeInsets = UIEdgeInsetsMake(-25, -25, -25, -25)
        let hitFrame = UIEdgeInsetsInsetRect(relativeFrame, hitTestEdgeInsets)
        return hitFrame.contains(point)
    }
}

给出的答案没有错。但是我想扩展jlarjlar的答案，因为它具有惊人的潜力，可以为其他控件（例如SearchBar）的相同问题增加价值。这是因为因为pointInside附加到UIView，所以可以继承任何控件来改善触摸区域。此答案还显示了有关如何实施完整解决方案的完整示例。

为您的按钮（或任何控件）创建一个新的子类

#import <UIKit/UIKit.h>

@interface MNGButton : UIButton

@end

接下来覆盖子类实现中的pointInside方法

@implementation MNGButton


-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    //increase touch area for control in all directions by 20
    CGFloat margin = 20.0;
    CGRect area = CGRectInset(self.bounds, -margin, -margin);
    return CGRectContainsPoint(area, point);
}


@end

在情节提要/ xib文件中，选择有问题的控件，然后打开身份检查器，然后输入自定义类的名称。

在包含按钮的场景的UIViewController类中，将按钮的类类型更改为子类的名称。

@property (weak, nonatomic) IBOutlet MNGButton *helpButton;

将您的情节提要/ xib按钮链接到属性IBOutlet，您的触摸区域将被扩展以适合子类中定义的区域。

除了重写pointInside方法与一起CGRectInset和CGRectContainsPoint方法，应该需要时间来检查CGGeometry用于延长任何UIView子类的矩形触摸区域。您也可以找到关于CGGeometry使用情况在一些不错的提示NSHipster。

例如，可以使用上述方法使触摸区域不规则，或者简单地选择将宽度触摸区域设置为水平触摸区域的两倍：

CGRect area = CGRectInset(self.bounds, -(2*margin), -margin);

注意：替换任何UI类控件应该在扩展不同控件的触摸区域（或任何UIView子类，如UIImageView等）上产生相似的结果。

这对我有用：

UIButton *button = [UIButton buttonWithType: UIButtonTypeCustom];
// set the image (here with a size of 32 x 32)
[button setImage: [UIImage imageNamed: @"myimage.png"] forState: UIControlStateNormal];
// just set the frame of the button (here 64 x 64)
[button setFrame: CGRectMake(xPositionOfMyButton, yPositionOfMyButton, 64, 64)];

不要更改UIButton的行为。

@interface ExtendedHitButton: UIButton

+ (instancetype) extendedHitButton;

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;

@end

@implementation ExtendedHitButton

+ (instancetype) extendedHitButton {
    return (ExtendedHitButton *) [ExtendedHitButton buttonWithType:UIButtonTypeCustom];
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    CGRect relativeFrame = self.bounds;
    UIEdgeInsets hitTestEdgeInsets = UIEdgeInsetsMake(-44, -44, -44, -44);
    CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, hitTestEdgeInsets);
    return CGRectContainsPoint(hitFrame, point);
}

@end

我正在使用一种更通用的方法-[UIView pointInside:withEvent:]。这使我可以修改任何UIView（而不只是）点击测试行为UIButton。

通常，在容器视图内放置一个按钮，这也限制了命中测试。例如，当按钮位于容器视图的顶部并且您想要向上扩展触摸目标时，还必须扩展容器视图的触摸目标。

@interface UIView(Additions)
@property(nonatomic) UIEdgeInsets hitTestEdgeInsets;
@end

@implementation UIView(Additions)

+ (void)load {
    Swizzle(self, @selector(pointInside:withEvent:), @selector(myPointInside:withEvent:));
}

- (BOOL)myPointInside:(CGPoint)point withEvent:(UIEvent *)event {

    if(UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero) || self.hidden ||
       ([self isKindOfClass:UIControl.class] && !((UIControl*)self).enabled))
    {
        return [self myPointInside:point withEvent:event]; // original implementation
    }
    CGRect hitFrame = UIEdgeInsetsInsetRect(self.bounds, self.hitTestEdgeInsets);
    hitFrame.size.width = MAX(hitFrame.size.width, 0); // don't allow negative sizes
    hitFrame.size.height = MAX(hitFrame.size.height, 0);
    return CGRectContainsPoint(hitFrame, point);
}

static char hitTestEdgeInsetsKey;
- (void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets {
    objc_setAssociatedObject(self, &hitTestEdgeInsetsKey, [NSValue valueWithUIEdgeInsets:hitTestEdgeInsets], OBJC_ASSOCIATION_RETAIN);
}

- (UIEdgeInsets)hitTestEdgeInsets {
    return [objc_getAssociatedObject(self, &hitTestEdgeInsetsKey) UIEdgeInsetsValue];
}

void Swizzle(Class c, SEL orig, SEL new) {

    Method origMethod = class_getInstanceMethod(c, orig);
    Method newMethod = class_getInstanceMethod(c, new);

    if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
        class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    else
        method_exchangeImplementations(origMethod, newMethod);
}
@end

这种方法的好处是，即使在情节提要中，您也可以通过添加用户定义的运行时属性来使用此方法。遗憾的是，UIEdgeInsets它不能在那里直接用作类型，但由于CGRect它还包含一个带有四个结构的结构，CGFloat因此可以通过选择“ Rect”并填写如下值来完美地工作：{{top, left}, {bottom, right}}。

我在Swift中使用以下类，还启用了Interface Builder属性来调整边距：

@IBDesignable
class ALExtendedButton: UIButton {

    @IBInspectable var touchMargin:CGFloat = 20.0

    override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        var extendedArea = CGRectInset(self.bounds, -touchMargin, -touchMargin)
        return CGRectContainsPoint(extendedArea, point)
    }
}

好了，您可以将UIButton放置在一个透明且稍大的UIView中，然后像在UIButton中一样在UIView实例上捕获触摸事件。这样，您仍然可以使用按钮，但是触摸区域更大。如果用户触摸视图而不是按钮，则必须手动处理按钮上的选定状态和突出显示状态。

其他可能性包括使用UIImage代替UIButton。

我已经能够以编程方式增加信息按钮的点击区域。“ i”图形不会改变比例，而是保持在新按钮框架的中心。

在Interface Builder中，信息按钮的大小似乎固定为18x19 [*]。通过将其连接到IBOutlet，我可以在代码中更改其框架大小而没有任何问题。

static void _resizeButton( UIButton *button )
{
    const CGRect oldFrame = infoButton.frame;
    const CGFloat desiredWidth = 44.f;
    const CGFloat margin = 
        ( desiredWidth - CGRectGetWidth( oldFrame ) ) / 2.f;
    infoButton.frame = CGRectInset( oldFrame, -margin, -margin );
}

[*]：iOS的更高版本似乎增加了信息按钮的点击范围。

这是我的Swift 3解决方案（基于此博客文章：http : //bdunagan.com/2010/03/01/iphone-tip-larger-hit-area-for-uibutton/）

class ExtendedHitAreaButton: UIButton {

    @IBInspectable var hitAreaExtensionSize: CGSize = CGSize(width: -10, height: -10)

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {

        let extendedFrame: CGRect = bounds.insetBy(dx: hitAreaExtensionSize.width, dy: hitAreaExtensionSize.height)

        return extendedFrame.contains(point) ? self : nil
    }
}

Chase的自定义命中测试实现为UIButton的子类。用Objective-C编写。

它似乎对init和buttonWithType:构造器都有效。对于我的需求而言，它是完美的，但是由于子类化UIButton可能比较繁琐，因此我想知道是否有人对此有毛病。

CustomeHitAreaButton.h

#import <UIKit/UIKit.h>

@interface CustomHitAreaButton : UIButton

- (void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets;

@end

CustomHitAreaButton.m

#import "CustomHitAreaButton.h"

@interface CustomHitAreaButton()

@property (nonatomic, assign) UIEdgeInsets hitTestEdgeInsets;

@end

@implementation CustomHitAreaButton

- (instancetype)initWithFrame:(CGRect)frame {
    if(self = [super initWithFrame:frame]) {
        self.hitTestEdgeInsets = UIEdgeInsetsZero;
    }
    return self;
}

-(void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets {
    self->_hitTestEdgeInsets = hitTestEdgeInsets;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    if(UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero) || !self.enabled || self.hidden) {
        return [super pointInside:point withEvent:event];
    }
    CGRect relativeFrame = self.bounds;
    CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitTestEdgeInsets);
    return CGRectContainsPoint(hitFrame, point);
}

@end

通过重写继承的UIButton实现。

Swift 2.2：

// don't forget that negative values are for outset
_button.hitOffset = UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)
...
class UICustomButton: UIButton {
    var hitOffset = UIEdgeInsets()

    override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        guard hitOffset != UIEdgeInsetsZero && enabled && !hidden else {
            return super.pointInside(point, withEvent: event)
        }
        return UIEdgeInsetsInsetRect(bounds, hitOffset).contains(point)
    }
}

WJBackgroundInsetButton.h

#import <UIKit/UIKit.h>

@interface WJBackgroundInsetButton : UIButton {
    UIEdgeInsets backgroundEdgeInsets_;
}

@property (nonatomic) UIEdgeInsets backgroundEdgeInsets;

@end

WJBackgroundInsetButton.m

#import "WJBackgroundInsetButton.h"

@implementation WJBackgroundInsetButton

@synthesize backgroundEdgeInsets = backgroundEdgeInsets_;

-(CGRect) backgroundRectForBounds:(CGRect)bounds {
    CGRect sup = [super backgroundRectForBounds:bounds];
    UIEdgeInsets insets = self.backgroundEdgeInsets;
    CGRect r = UIEdgeInsetsInsetRect(sup, insets);
    return r;
}

@end

切勿覆盖类别中的方法。子类按钮并覆盖- pointInside:withEvent:。例如，如果按钮的侧面小于44像素（建议将其作为最小可触碰区域），请使用以下方法：

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    return (ABS(point.x - CGRectGetMidX(self.bounds)) <= MAX(CGRectGetMidX(self.bounds), 22)) && (ABS(point.y - CGRectGetMidY(self.bounds)) <= MAX(CGRectGetMidY(self.bounds), 22));
}

我为此专门制作了一个库。

您可以选择使用UIView类别，而无需子类别：

@interface UIView (KGHitTesting)
- (void)setMinimumHitTestWidth:(CGFloat)width height:(CGFloat)height;
@end

或者，您可以继承UIView或UIButton并设置minimumHitTestWidthand / orminimumHitTestHeight。然后，您的按钮点击测试区域将由这两个值表示。

就像其他解决方案一样，它使用该- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event方法。当iOS执行命中测试时，将调用此方法。这篇博客文章很好地描述了iOS点击测试的工作原理。

https://github.com/kgaidis/KGHitTestingViews

@interface KGHitTestingButton : UIButton <KGHitTesting>

@property (nonatomic) CGFloat minimumHitTestHeight; 
@property (nonatomic) CGFloat minimumHitTestWidth;

@end

您也可以只继承类并使用Interface Builder，而无需编写任何代码：

基于上面的giaset的答案（我找到了最优雅的解决方案），这是swift 3版本：

import UIKit

fileprivate let minimumHitArea = CGSize(width: 44, height: 44)

extension UIButton {
    open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        // if the button is hidden/disabled/transparent it can't be hit
        if isHidden || !isUserInteractionEnabled || alpha < 0.01 { return nil }

        // increase the hit frame to be at least as big as `minimumHitArea`
        let buttonSize = bounds.size
        let widthToAdd = max(minimumHitArea.width - buttonSize.width, 0)
        let heightToAdd = max(minimumHitArea.height - buttonSize.height, 0)
        let largerFrame = bounds.insetBy(dx: -widthToAdd / 2, dy: -heightToAdd / 2)

        // perform hit test on larger frame
        return (largerFrame.contains(point)) ? self : nil
    }
}

就这么简单：

class ChubbyButton: UIButton {
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        return bounds.insetBy(dx: -20, dy: -20).contains(point)
    }
}

这就是全部。

我在tableviewcell.accessoryView内部的按钮上使用此技巧来扩大其触摸区域

#pragma mark - Touches

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch                  = [touches anyObject];
    CGPoint location                = [touch locationInView:self];
    CGRect  accessoryViewTouchRect  = CGRectInset(self.accessoryView.frame, -15, -15);

    if(!CGRectContainsPoint(accessoryViewTouchRect, location))
        [super touchesBegan:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch                  = [touches anyObject];
    CGPoint location                = [touch locationInView:self];
    CGRect  accessoryViewTouchRect  = CGRectInset(self.accessoryView.frame, -15, -15);

    if(CGRectContainsPoint(accessoryViewTouchRect, location) && [self.accessoryView isKindOfClass:[UIButton class]])
    {
        [(UIButton *)self.accessoryView sendActionsForControlEvents:UIControlEventTouchUpInside];
    }
    else
        [super touchesEnded:touches withEvent:event];
}

我只是在Swift 2.2 中完成了@Chase 解决方案的移植

import Foundation
import ObjectiveC

private var hitTestEdgeInsetsKey: UIEdgeInsets = UIEdgeInsetsZero

extension UIButton {
    var hitTestEdgeInsets:UIEdgeInsets {
        get {
            let inset = objc_getAssociatedObject(self, &hitTestEdgeInsetsKey) as? NSValue ?? NSValue(UIEdgeInsets: UIEdgeInsetsZero)
            return inset.UIEdgeInsetsValue()
        }
        set {
            let inset = NSValue(UIEdgeInsets: newValue)
            objc_setAssociatedObject(self, &hitTestEdgeInsetsKey, inset, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }

    public override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        guard !UIEdgeInsetsEqualToEdgeInsets(hitTestEdgeInsets, UIEdgeInsetsZero) && self.enabled == true && self.hidden == false else {
            return super.pointInside(point, withEvent: event)
        }
        let relativeFrame = self.bounds
        let hitFrame = UIEdgeInsetsInsetRect(relativeFrame, hitTestEdgeInsets)
        return CGRectContainsPoint(hitFrame, point)
    }
}

你可以这样使用

button.hitTestEdgeInsets = UIEdgeInsetsMake(-10, -10, -10, -10)

有关其他任何参考，请参见https://stackoverflow.com/a/13067285/1728552

@antoine的答案格式为Swift 4

class ExtendedHitButton: UIButton
{
    override func point( inside point: CGPoint, with event: UIEvent? ) -> Bool
    {
        let relativeFrame = self.bounds
        let hitTestEdgeInsets = UIEdgeInsetsMake( -44, -44, -44, -44 ) // Apple recommended hit target
        let hitFrame = UIEdgeInsetsInsetRect( relativeFrame, hitTestEdgeInsets )
        return hitFrame.contains( point );
    }
}

我遵循了Chase的回答，并且效果很好，当您创建的Arrea太大，大于取消选择按钮的区域（如果区域不大）时，它不会调用UIControlEventTouchUpInside事件的选择器，这是一个问题。

我认为任何方向或类似尺寸的尺寸都超过200。

我对这款游戏太晚了，但是想尝试一种可以解决您问题的简单技术。这是我的典型程序化UIButton代码段：

UIImage *arrowImage = [UIImage imageNamed:@"leftarrow"];
arrowButton = [[UIButton alloc] initWithFrame:CGRectMake(15.0, self.frame.size.height-35.0, arrowImage.size.width/2, arrowImage.size.height/2)];
[arrowButton setBackgroundImage:arrowImage forState:UIControlStateNormal];
[arrowButton addTarget:self action:@selector(onTouchUp:) forControlEvents:UIControlEventTouchUpOutside];
[arrowButton addTarget:self action:@selector(onTouchDown:) forControlEvents:UIControlEventTouchDown];
[arrowButton addTarget:self action:@selector(onTap:) forControlEvents:UIControlEventTouchUpInside];
[arrowButton addTarget:self action:@selector(onTouchUp:) forControlEvents:UIControlEventTouchDragExit];
[arrowButton setUserInteractionEnabled:TRUE];
[arrowButton setAdjustsImageWhenHighlighted:NO];
[arrowButton setTag:1];
[self addSubview:arrowButton];

我正在为按钮加载透明的png图像并设置背景图像。我正在基于UIImage设置框架，并为视网膜缩放50％。好的，也许您同意以上所述，但是，如果您想使点击区域更大，并且让您省去头痛的话：

我要做的是，在photoshop中打开图像，然后简单地将画布大小增加到120％并保存。实际上，您已经使用透明像素将图像放大了。

只是一种方法。

上面的@jlajlar的回答似乎很好并且很直接，但是与Xamarin.iOS不匹配，因此我将其转换为Xamarin。如果您在Xamarin iOS上寻找解决方案，请按以下步骤进行：

public override bool PointInside (CoreGraphics.CGPoint point, UIEvent uievent)
{
    var margin = -10f;
    var area = this.Bounds;
    var expandedArea = area.Inset(margin, margin);
    return expandedArea.Contains(point);
}

您可以将此方法添加到覆盖UIView或UIImageView的类中。这很好用:)

没有一个答案适合我，因为我在该按钮上使用了背景图片和标题。此外，按钮将随着屏幕尺寸的改变而调整大小。

相反，我通过增大png透明区域来扩大点击区域。