ios 添加到cell 上的button點選無效！擴大button的點選區域（黑魔法）

一般情況下點選效果都是正常的！要不然你對它做了什麼？一般細心的小夥伴都沒有遇到這種情況，但是呢！

當然我是二班的！在這裡我主要講兩個問題，解決問題和普及魔法。

一.普及問題(button在cell上點選無效)

自定義一個cell，cell裡邊creat了一個button！然後調試了半天，什麼反應都沒有！

1.button的enable 設定為yes可點選的。

1.我以為我設定了互動禁用！

    self.userInteractionEnabled = YES;

2.button的frame越界了！

首先你要明白action的傳遞的載體，父試圖的載體。

二.普及魔法（擴大button的點選區域）

啥都不說了，直接上代碼！！！

//

//  UIButton+EnlargeEdge.h

//  peter.zhang

//  Created by peter.zhang on 8/28/14.

//  Copyright (c) 2014 peter. All rights reserved.

#import <objc/runtime.h>

@interface UIButton (EnlargeEdge)

- (void)setEnlargeEdge:(CGFloat) size;

- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left;

@end

---------------

#import "UIButton+EnlargeEdge.h"

@implementation UIButton (EnlargeEdge)

static char topNameKey;

static char rightNameKey;

static char bottomNameKey;

static char leftNameKey;

- (void)setEnlargeEdge:(CGFloat) size

{

    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);

}

- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left

    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);

    objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_COPY_NONATOMIC);

- (CGRect)enlargedRect

    NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);

    NSNumber* rightEdge = objc_getAssociatedObject(self, &rightNameKey);

    NSNumber* bottomEdge = objc_getAssociatedObject(self, &bottomNameKey);

    NSNumber* leftEdge = objc_getAssociatedObject(self, &leftNameKey);

    if (topEdge && rightEdge && bottomEdge && leftEdge)

    {

        return CGRectMake(self.bounds.origin.x - leftEdge.floatValue,

                          self.bounds.origin.y - topEdge.floatValue,

                          self.bounds.size.width + leftEdge.floatValue + rightEdge.floatValue,

                          self.bounds.size.height + topEdge.floatValue + bottomEdge.floatValue);

    }

    else

        return self.bounds;

- (UIView*)hitTest:(CGPoint) point withEvent:(UIEvent*) event

    CGRect rect = [self enlargedRect];

    if (CGRectEqualToRect(rect, self.bounds))

        return [super hitTest:point withEvent:event];

    return CGRectContainsPoint(rect, point) ? self : nil;

拖進工程直接用就行了！！！！多多指教

    UIButton *btnCancel = [UIButton buttonWithType:UIButtonTypeCustom];

    btnCancel.frame = CGRectMake(100, 100, 10, 10);

    btnCancel.backgroundColor = [UIColor redColor];

    [btnCancel setEnlargeEdgeWithTop:10 right:10 bottom:10 left:10];

    [btnCancel addTarget:self action:@selector(cancelBtnClick:) forControlEvents:UIControlEventTouchUpInside];

    [topView addSubview:btnCancel];