自定义Button的样式和buttonBlock
遇到的问题
一个分类就解决问题,在分类中添加了block属性,用到runtime.
代码引用
.h文件
//
#import <UIKit/UIKit.h>
/**
* buttonType
*/
typedef NS_ENUM(NSUInteger, PXYCustomerButtonType){
//标题的位置
PXYCustomerButtonTypeTop, // 标题的位置在上;
PXYCustomerButtonTypeBelow, // 标题的位置在下;
PXYCustomerButtonTypeLeft, // 标题的位置在左;
PXYCustomerButtonTypeRight, // 标题的位置在右;
};
typedef void (^ButtonBlock)(UIButton *sender);
@interface UIButton (PXYCustom)
@property(nonatomic,copy)ButtonBlock buttonblock;
/**
* ButtonBlock
*
* @param block Button点击事件
*/
- (void)addTapBlock:(ButtonBlock)block;
/*
* @brief 标题在上 图片在下
*
* @param space 它们之间的间距
*/
/**
*设置标题;
*
*/
- (void)titleTopButtonImageWithTitleStyle:(PXYCustomerButtonType)type Space:(CGFloat)space;
@end
代码引用
.m文件
#import"UIButton+PXYCustom.h"
#import <objc/runtime.h>
//关键字-- 关键字是一个void类型的指针。每一个关联的关键字必须是唯一的。通常都是会采用静态变量来作为关键字。
static const void *IndieBandNameKey = &IndieBandNameKey;
@implementation UIButton (PXYCustom)
- (ButtonBlock ) buttonblock {
return objc_getAssociatedObject(self, IndieBandNameKey);
}
- (void)setButtonblock:(ButtonBlock)buttonblock{
/**
* objc_setAssociatedObject来把一个对象与另外一个对象进行关联。该函数需要四个参数：源对象，关键字，关联的对象和一个关联策略
关联策略表明了相关的对象是通过赋值，保留引用还是复制的方式进行关联的；还有这种关联是原子的还是非原子的。这里的关联策略和声明属性时的很类似。这种关联策略是通过使用预先定义好的常量来表示的
*/
/*
typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) {
OBJC_ASSOCIATION_ASSIGN = 0,
OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1,
OBJC_ASSOCIATION_COPY_NONATOMIC = 3,
OBJC_ASSOCIATION_RETAIN = 01401,
OBJC_ASSOCIATION_COPY = 01403
*/
objc_setAssociatedObject(self, IndieBandNameKey, buttonblock, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (void)addTapBlock:(ButtonBlock)block
{
self.buttonblock = block;
[self addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction:(UIButton *)button
{
if(self.buttonblock) {
self.buttonblock(button);
}
}
/** 标题在上 */
- (void)titleOverTheImageTopWithSpace:(CGFloat)space
{
[self judgeTheTitleInImageTop:YES space:space];
}
/** 标题在下 */
-(void)titleBelowTheImageWithSpace:(CGFloat)space
{
[self judgeTheTitleInImageTop:NO space:space];
}
/** 判断标题是不是在上 */
- (void)judgeTheTitleInImageTop:(BOOL)isTop space:(float)space ;
{
[self resetEdgeInsets];
[self setNeedsLayout];
[self layoutIfNeeded];
CGRect contentRect = [self contentRectForBounds:self.bounds];
CGSize titleSize = [self titleRectForContentRect:contentRect].size;
CGSize imageSize = [self imageRectForContentRect:contentRect].size;
float halfWidth = (titleSize.width + imageSize.width)/2;
float halfHeight = (titleSize.height + imageSize.height)/2;
float topInset = MIN(halfHeight, titleSize.height);
float leftInset = (titleSize.width - imageSize.width)>0?(titleSize.width - imageSize.width)/2:0;
float bottomInset = (titleSize.height - imageSize.height)>0?(titleSize.height - imageSize.height)/2:0;
float rightInset = MIN(halfWidth, titleSize.width);
if (isTop) {
[self setTitleEdgeInsets:UIEdgeInsetsMake(-titleSize.height-space, - halfWidth, imageSize.height+space, halfWidth)];
[self setContentEdgeInsets:UIEdgeInsetsMake(topInset+space, leftInset, -bottomInset, -rightInset)];
} else {
[self setTitleEdgeInsets:UIEdgeInsetsMake(imageSize.height+space, - halfWidth, -titleSize.height-space, halfWidth)];
[self setContentEdgeInsets:UIEdgeInsetsMake(-bottomInset, leftInset, topInset+space, -rightInset)];
}
}
/** 图片在左 系统默认的样式 只需提供修改内边距的接口*/
-(void)imageOnTheTitleLeftWithSpace:(CGFloat)space{
[self resetEdgeInsets];
[self setTitleEdgeInsets:UIEdgeInsetsMake(0, space, 0, -space)];
[self setContentEdgeInsets:UIEdgeInsetsMake(0, 0, 0, space)];
}
/** 图片再右 */
- (void)imageOnTheTitleRightWithSpace:(CGFloat)space
{
[self resetEdgeInsets];
[self setNeedsLayout];
[self layoutIfNeeded];
CGRect contentRect = [self contentRectForBounds:self.bounds];
CGSize titleSize = [self titleRectForContentRect:contentRect].size;
CGSize imageSize = [self imageRectForContentRect:contentRect].size;
[self setContentEdgeInsets:UIEdgeInsetsMake(0, 0, 0, space)];
[self setTitleEdgeInsets:UIEdgeInsetsMake(0, -imageSize.width, 0, imageSize.width)];
[self setImageEdgeInsets:UIEdgeInsetsMake(0, titleSize.width+space, 0, -titleSize.width - space)];
}
//重置内边距
- (void)resetEdgeInsets
{
[self setContentEdgeInsets:UIEdgeInsetsZero];
[self setImageEdgeInsets:UIEdgeInsetsZero];
[self setTitleEdgeInsets:UIEdgeInsetsZero];
}
- (void)titleTopButtonImageWithTitleStyle:(PXYCustomerButtonType)type Space:(CGFloat)space {
switch (type) {
case PXYCustomerButtonTypeTop:
{
//标题在上
[self titleOverTheImageTopWithSpace:space];
}
break;
case PXYCustomerButtonTypeBelow:
{
//标题在下
[self titleBelowTheImageWithSpace:space];
}
break;
case PXYCustomerButtonTypeRight:
{
//标题在右
[self imageOnTheTitleLeftWithSpace:space];
}
break;
case PXYCustomerButtonTypeLeft:
{
//标题在左
[self imageOnTheTitleRightWithSpace:space];
}
break;
default:
break;
}
}
@end
大家一起学习;Demo
