UIButton+EnlargeTouchArea.h 文件
//
// UIButton+EnlargeTouchArea.h
// BtnClickDemo
//
// Created by apple on 2018/6/8.
// Copyright ? 2018年 wxp. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIButton (EnlargeTouchArea)
- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left;
@end
//
// UIButton+EnlargeTouchArea.m
// BtnClickDemo
//
// Created by apple on 2018/6/8.
// Copyright ? 2018年 wxp. All rights reserved.
//
#import "UIButton+EnlargeTouchArea.h"
#import <objc/runtime.h>
@implementation UIButton (EnlargeTouchArea)
static char topNameKey;
static char rightNameKey;
static char bottomNameKey;
static char leftNameKey;
/**
* 向按鈕的四個方向延伸響應(yīng)面積
*
* @param top 上間距
* @param left 左間距
* @param bottom 下間距
* @param right 右間距
*/
- (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);
}
//獲取當前的響應(yīng)rect
- (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;
}
}
//系統(tǒng)方法重載
- (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;
}
@end
viewController.m
//
// ViewController.m
// BtnClickDemo
//
// Created by apple on 2018/6/8.
// Copyright ? 2018年 wxp. All rights reserved.
//
#import "ViewController.h"
#import "UIButton+EnlargeTouchArea.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.button setEnlargeEdgeWithTop:60 right:80 bottom:100 left:100];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)btnClick:(id)sender {
NSLog(@"點擊");
}
@end
objc_setAssociatedObject 關(guān)聯(lián)對象
objc_setAssociatedObject 相當于 setValue:forKey 進行關(guān)聯(lián)value對象;
- key：要保證全局唯一萌业，key與關(guān)聯(lián)的對象是一一對應(yīng)關(guān)系敛苇。必須全局唯一。通常用@selector(methodName)作為key。
- value：要關(guān)聯(lián)的對象。
- policy：關(guān)聯(lián)策略。有五種關(guān)聯(lián)策略盛杰。
- OBJC_ASSOCIATION_ASSIGN 等價于 @property(assign)。
- OBJC_ASSOCIATION_RETAIN_NONATOMIC等價于 @property(strong, nonatomic)藐石。
- OBJC_ASSOCIATION_COPY_NONATOMIC等價于@property(copy, nonatomic)即供。
- OBJC_ASSOCIATION_RETAIN等價于@property(strong,atomic)。
- OBJC_ASSOCIATION_COPY等價于@property(copy, atomic)于微。
