前言
之前都用的继承的方式实现扩大点击事件，绑定block，最好还是扩展为UIButton的分类,特意整理一下。
效果图：
button扩展.gif
代码
.h
typedef NS_ENUM(NSUInteger, LXButtonEdgeInsetsStyle) {
LXButtonEdgeInsetsStyleTop, // image在上，label在下
LXButtonEdgeInsetsStyleLeft, // image在左，label在右
LXButtonEdgeInsetsStyleBottom, // image在下，label在上
LXButtonEdgeInsetsStyleRight // image在右，label在左
};
#define Font(f) [UIFont systemFontOfSize:(f)]
typedef void (^ButtonBlock)(UIButton *button);
@interface UIButton (LXExpandBtn)
@property(nonatomic,strong)NSString *buttonId;//标识
@property(nonatomic,copy)ButtonBlock block;//添加点击事件
@property (nonatomic,assign) UIEdgeInsets hitTestEdgeInsets;//点击区域，默认为（0，0，0，0）; 负的为扩大
//frame初始化
+(UIButton *)LXButtonWithTitle:(NSString *)title titleFont:(UIFont *)titleLabelFont Image:(UIImage *)image backgroundImage:(UIImage *)backgroundImage backgroundColor:(UIColor *)backgroundColor titleColor:(UIColor *)titleLabelColor frame:(CGRect)frame;
//约束初始化
+(UIButton *)LXButtonNoFrameWithTitle:(NSString *)title titleFont:(UIFont *)titleLabelFont Image:(UIImage *)image backgroundImage:(UIImage *)backgroundImage backgroundColor:(UIColor *)backgroundColor titleColor:(UIColor *)titleLabelColor;
//添加block
-(void)addClickBlock:(ButtonBlock)block;
/**
* 设置button的titleLabel和imageView的布局样式，及间距
*
* @param style titleLabel和imageView的布局样式
* @param space titleLabel和imageView的间距
*/
- (void)layoutButtonWithEdgeInsetsStyle:(LXButtonEdgeInsetsStyle)style
imageTitleSpace:(CGFloat)space;
.m
#import "UIButton+LXExpandBtn.h"
#import <objc/runtime.h>
static const NSString *KEY_ButtonId = @"buttonId";
static const NSString *KEY_ButtonBlock = @"buttonBlock";
static const NSString *KEY_HitTestEdgeInsets = @"hitTestEdgeInsets";
@implementation UIButton (LXExpandBtn)
//扩大点击区域
- (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);
}
+(UIButton *)LXButtonWithTitle:(NSString *)title titleFont:(UIFont *)titleLabelFont Image:(UIImage *)image backgroundImage:(UIImage *)backgroundImage backgroundColor:(UIColor *)backgroundColor titleColor:(UIColor *)titleLabelColor frame:(CGRect)frame
{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:image forState:UIControlStateNormal];
[button setBackgroundImage:backgroundImage forState:UIControlStateNormal];
[button setTitle:title forState:UIControlStateNormal];
[button setTitleColor:titleLabelColor forState:UIControlStateNormal];
button.backgroundColor = backgroundColor;
button.frame = frame;
button.titleLabel.font = titleLabelFont;
return button;
}
+(UIButton *)LXButtonNoFrameWithTitle:(NSString *)title titleFont:(UIFont *)titleLabelFont Image:(UIImage *)image backgroundImage:(UIImage *)backgroundImage backgroundColor:(UIColor *)backgroundColor titleColor:(UIColor *)titleLabelColor
{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:image forState:UIControlStateNormal];
[button setBackgroundImage:backgroundImage forState:UIControlStateNormal];
[button setTitle:title forState:UIControlStateNormal];
[button setTitleColor:titleLabelColor forState:UIControlStateNormal];
button.backgroundColor = backgroundColor;
button.titleLabel.font = titleLabelFont;
return button;
}
//添加点击事件-
-(void)addClickBlock:(ButtonBlock)block
{
self.block = block;
[self addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
}
-(void)buttonAction:(UIButton *)button
{
self.block(button);
}
- (void)layoutButtonWithEdgeInsetsStyle:(LXButtonEdgeInsetsStyle)style
imageTitleSpace:(CGFloat)space
{
// self.backgroundColor = [UIColor cyanColor];
/**
* 前置知识点：titleEdgeInsets是title相对于其上下左右的inset，跟tableView的contentInset是类似的，
* 如果只有title，那它上下左右都是相对于button的，image也是一样；
* 如果同时有image和label，那这时候image的上左下是相对于button，右边是相对于label的；title的上右下是相对于button，左边是相对于image的。
*/
// 1. 得到imageView和titleLabel的宽、高
CGFloat imageWith = self.imageView.frame.size.width;
CGFloat imageHeight = self.imageView.frame.size.height;
CGFloat labelWidth = 0.0;
CGFloat labelHeight = 0.0;
if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
// 由于iOS8中titleLabel的size为0，用下面的这种设置
labelWidth = self.titleLabel.intrinsicContentSize.width;
labelHeight = self.titleLabel.intrinsicContentSize.height;
} else {
labelWidth = self.titleLabel.frame.size.width;
labelHeight = self.titleLabel.frame.size.height;
}
// 2. 声明全局的imageEdgeInsets和labelEdgeInsets
UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;
UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;
// 3. 根据style和space得到imageEdgeInsets和labelEdgeInsets的值
switch (style) {
case LXButtonEdgeInsetsStyleTop:
{
imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0, 0, 0, -labelWidth);
labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith, -imageHeight-space/2.0, 0);
}
break;
case LXButtonEdgeInsetsStyleLeft:
{
imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);
labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);
}
break;
case LXButtonEdgeInsetsStyleBottom:
{
imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);
labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);
}
break;
case LXButtonEdgeInsetsStyleRight:
{
imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);
labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);
}
break;
default:
break;
}
// 4. 赋值
self.titleEdgeInsets = labelEdgeInsets;
self.imageEdgeInsets = imageEdgeInsets;
}
#pragma mark--- getter setter--
//分类中不能直接使用setter和getter、需要使用运行时
- (void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets
{
NSValue *value = [NSValue value:&hitTestEdgeInsets withObjCType:@encode(UIEdgeInsets)];
objc_setAssociatedObject(self, &KEY_HitTestEdgeInsets, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIEdgeInsets)hitTestEdgeInsets
{
NSValue *value = objc_getAssociatedObject(self, &KEY_HitTestEdgeInsets);
if(value)
{
UIEdgeInsets edgeInsets;
[value getValue:&edgeInsets];
return edgeInsets;
}
else
{
return UIEdgeInsetsZero;
}
}
-(void)setButtonId:(NSString *)buttonId{
objc_setAssociatedObject(self, &KEY_ButtonId, buttonId, OBJC_ASSOCIATION_RETAIN);
}
-(NSString *)buttonId{
return objc_getAssociatedObject(self, &KEY_ButtonId);
}
-(void)setBlock:(ButtonBlock)block{
objc_setAssociatedObject(self, &KEY_ButtonBlock, block, OBJC_ASSOCIATION_RETAIN);
}
-(ButtonBlock)block{
return objc_getAssociatedObject(self, &KEY_ButtonBlock);
}
@end
使用
//扩大点击区域
UIButton *button2 =[UIButton LXButtonWithTitle:@"button2" titleFont:Font(15) Image:nil backgroundImage:nil backgroundColor:[UIColor whiteColor] titleColor:[UIColor blackColor] frame:CGRectMake(0, 0, 200, 200)];
[button2 setTitleColor:[UIColor purpleColor] forState:UIControlStateHighlighted];
[button2 setTitle:@"button2点到了" forState:UIControlStateHighlighted];
button2.layer.borderColor =[UIColor redColor].CGColor;
button2.layer.borderWidth = 5;
button2.center = CGPointMake(125, 125);
button2.hitTestEdgeInsets =UIEdgeInsetsMake(-50, -50, -50, -50);
[view addSubview:button2];
[button2 addClickBlock:^(UIButton *button) {
NSLog(@"点击了button2");
}];
//布局方式
[self.topBtn layoutButtonWithEdgeInsetsStyle:LXButtonEdgeInsetsStyleTop imageTitleSpace:10];
demo 地址：UIButton扩展
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