Swizzle运行时

#import <Foundation/Foundation.h>

//获取一个类的所有属性名字:类型的名字，具有@property的,
父类的获取不了！

NSDictionary *GetPropertyListOfObject(NSObject *object);

NSDictionary *GetPropertyListOfClass(Class cls);

void Swizzle(Class c, SEL origSEL,
SEL newSEL)

//

// ObjcRuntime.m

// EMeal_Cook

//

// Created by Wujg on 15/10/15.

// Copyright © 2015年 Wujg. All rights reserved.

//

#import "ObjcRuntime.h"

#import <objc/runtime.h>

NSDictionary *GetPropertyListOfObject(NSObject *object) {

return
GetPropertyListOfClass([object
class]);

}

NSDictionary *GetPropertyListOfClass(Class cls) {

NSMutableDictionary *dict = [NSMutableDictionary
dictionary];

unsigned
int outCount, i;

objc_property_t *properties =
class_copyPropertyList(cls, &outCount);

for(i =
0; i < outCount; i++) {

objc_property_t property = properties[i];

const
char *propName =
property_getName(property);

const
char *propType =
property_getAttributes(property);

if(propType&&propName) {

NSArray *anAttribute = [[NSString
stringWithUTF8String:propType]componentsSeparatedByString:@","];

NSString *aType = anAttribute[0];

[dict setObject:aType
forKey:[NSString
stringWithUTF8String:propName]];

}

}

free(properties);

return dict;

}

//静态就交换静态，实例方法就交换实例方法

void Swizzle(Class c, SEL origSEL,
SEL newSEL) {

Method origMethod =
class_getInstanceMethod(c, origSEL);

Method newMethod =
nil;

if (!origMethod) {

origMethod = class_getClassMethod(c, origSEL);

if (!origMethod) {

return;

}

newMethod = class_getClassMethod(c, newSEL);

if (!newMethod) {

return;

}

} else {

newMethod = class_getInstanceMethod(c, newSEL);

if (!newMethod) {

return;

}

}

//自身已经有了就添加不成功，直接交换即可

if(class_addMethod(c, origSEL,
method_getImplementation(newMethod),
method_getTypeEncoding(newMethod))) {

class_replaceMethod(c, newSEL,
method_getImplementation(origMethod),
method_getTypeEncoding(origMethod));

} else {

method_exchangeImplementations(origMethod, newMethod);

}

}