iOS开发 Runtime使用大全(二)

继续上一篇

2.添加属性

一般情况下，使用Category只能添加方法，不过使用runtime就可以添加属性。

@interface NSObject (Category)//因为需要运行时添加策略，所以这里不写@property NSString *name;@end

#import "NSObject+Category.h"#import <objc/runtime.h>@implementation NSObject (Category)-(void)setName:(NSString *)name{    //源对象    //key    //关联对象    //关联策略  weak、strong，redonly等    objc_setAssociatedObject(self, "WenCheng", name, OBJC_ASSOCIATION_RETAIN_NONATOMIC);}-(NSString *)name{    //返回指定键的关联对象的值    //self：关联源对象    //“name”：关联的key    return objc_getAssociatedObject(self, "WenCheng");}@end

3.交换方法

//    得到类的实例方法//    class_getInstanceMethod//    得到类的类方法//    class_getClassMethod    Method oldMethod = class_getInstanceMethod([self class], @selector(viewWillAppear:));    Method newMethod = class_getInstanceMethod([self class], @selector(addFind));//交换    method_exchangeImplementations(oldMethod, newMethod);

项目中使用

1.按钮点击间隔

创建Category，添加“时间间隔”和“是否可点击”。

@interface UIButton (JC)@property (nonatomic,assign) NSTimeInterval jc_clickInterval;//添加点击事件的间隔时间@property (nonatomic, assign) BOOL jc_isIgnoreClick;//是否忽略点击事件,不响应点击事件@end

static const char *JC_clickInterval = "JC_clickInterval";static const char *JC_ignoreClick = "JC_ignoreClick";#pragma mark - 写get和set方法-(NSTimeInterval)jc_clickInterval{    return [objc_getAssociatedObject(self, JC_clickInterval) doubleValue];}-(void)setJc_clickInterval:(NSTimeInterval)jc_clickInterval{    objc_setAssociatedObject(self, JC_clickInterval, @(jc_clickInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}-(BOOL)jc_isIgnoreClick{    return [objc_getAssociatedObject(self, JC_ignoreClick) boolValue];}-(void)setJc_isIgnoreClick:(BOOL)jc_isIgnoreClick{    objc_setAssociatedObject(self, JC_ignoreClick, @(jc_isIgnoreClick), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}#pragma mark - 拦截点击事件+(void)load{    Method old = class_getInstanceMethod(self, @selector(sendAction:to:forEvent:));    Method new = class_getInstanceMethod(self, @selector(jcSendAction:to:forEvent:));    method_exchangeImplementations(old, new);}#pragma mark - 判断是否可以点击- (void)jcSendAction:(SEL)action to:(nullable id)target forEvent:(nullable UIEvent *)event{    if (self.jc_isIgnoreClick) return;    if (self.jc_clickInterval > 0) {        self.jc_isIgnoreClick = YES;        //多少秒后调用方法        [self performSelector:@selector(setJc_isIgnoreClick:) withObject:@(NO) afterDelay:self.jc_clickInterval];    }    //调用原方法    [self jcSendAction:action to:target forEvent:event];}