Objective-C Runtime技术调研(四)
一、特征篇
TridonLee在大家心目中应该有很多特征吧，下面我们通过代码来获取TridonLee的特征。
TLPeople.h文件
@interface TLPeople :NSObject
{
NSString*_occupation;
NSString*_nationlity;
}
@property(nonatomic,copy)NSString*name;
@property(nonatomic)NSUIntegerage;
- (NSDictionary*)allProperties;
- (NSDictionary*)allIvars;
- (NSDictionary*)allMethods;
@end
TLPeople.m文件
#if TARGET_IPHONE_SIMULATOR
#import <objc/objc-runtime.h>
#else
#import <objc/runtime.h>
#import <objc/message.h>
#endif
@implementationTLPeople
-(NSDictionary*)allProperties {
unsignedintcount =0;
//获取类的所有属性，如果没有属性count就为0
objc_property_t*properties =class_copyPropertyList([selfclass], &count);
NSMutableDictionary*resultDict = [@{}mutableCopy];
for(NSUIntegeri =0; i < count; i ++) {
//获取属性的名称和值
constchar*propertyName =property_getName(properties[i]);
NSString*name = [NSStringstringWithUTF8String:propertyName];
idpropertyValue = [selfvalueForKey:name];
if(propertyValue) {
resultDict[name] = propertyValue;
}else{
resultDict[name] =@"字典的key对应的value不能为nil哦！";
}
}
//这里properties是一个数组指针，我们需要使用free函数来释放内存。
free(properties);
returnresultDict;
}
- (NSDictionary*)allIvars
{
unsignedintcount =0;
NSMutableDictionary*resultDict = [@{}mutableCopy];
Ivar*ivars =class_copyIvarList([selfclass], &count);
for(NSUIntegeri =0; i < count; i ++) {
constchar*varName =ivar_getName(ivars[i]);
NSString*name = [NSStringstringWithUTF8String:varName];
idvarValue = [selfvalueForKey:name];
if(varValue) {
resultDict[name] = varValue;
}else{
resultDict[name] =@"字典的key对应的value不能为nil哦！";
}
}
free(ivars);
returnresultDict;
}
- (NSDictionary*)allMethods
{
unsignedintcount =0;
NSMutableDictionary*resultDict = [@{}mutableCopy];
//获取类的所有方法，如果没有方法count就为0
Method*methods =class_copyMethodList([selfclass], &count);
for(NSUIntegeri =0; i < count; i ++) {
//获取方法名称
SELmethodSEL =method_getName(methods[i]);
constchar*methodName =sel_getName(methodSEL);
NSString*name = [NSStringstringWithUTF8String:methodName];
//获取方法的参数列表
intarguments =method_getNumberOfArguments(methods[i]);
resultDict[name] =@(arguments-2);
}
free(methods);
returnresultDict;
}
@end
在main.m中运行以下代码
int main(intargc,constchar* argv[]) {
@autoreleasepool{
TLPeople*liTeacher = [[TLPeoplealloc]init];
liTeacher.name=@"TridonLee";
liTeacher.age=18;
[liTeachersetValue:@"Teacher"forKey:@"occupation"];
NSDictionary*propertyResultDic = [liTeacherallProperties];
for(NSString*propertyNameinpropertyResultDic.allKeys) {
NSLog(@"propertyName:%@, propertyValue:%@",propertyName, propertyResultDic[propertyName]);
}
NSDictionary*ivarResultDic = [liTeacherallIvars];
for(NSString*ivarNameinivarResultDic.allKeys) {
NSLog(@"ivarName:%@, ivarValue:%@",ivarName, ivarResultDic[ivarName]);
}
NSDictionary*methodResultDic = [liTeacherallMethods];
for(NSString*methodNameinmethodResultDic.allKeys) {
NSLog(@"methodName:%@, argumentsCount:%@", methodName, methodResultDic[methodName]);
}
}
return 0;
}
最后的输出结果如下：
是不是有点失望，我没有加一些特殊的技能，留给下文了。此实战内容是通过TridonLee的一些特征学习：如何获取对象所有的属性名称和属性值、获取对象所有成员变量名称和变量值、获取对象所有的方法名和方法参数数量。
Demo传送门-> 4.2特征篇Demo
