cocoa之高级开发RunTime初级基本变数

### 做iOS开发时间也不短了，是时候把自己所见所闻所写的拿出来分享一下了

对象拷贝：

id object_copy(id obj, size_t size) // 对象释放 
id object_dispose(id obj)
TsetClass *obj = [TsetClassnew];
id objTest =object_copy(obj,sizeof(obj));

(lldb)po &obj
0x00007fff54a7cb08
(lldb)po &objTest
0x00007fff54a7cb00
无疑问打印的内存地址不是一样的，此方法类似指针的深拷贝

深拷贝以及浅拷贝

• 深拷贝以及浅拷贝
  浅复制尽复制对象本身，对象里的属性、包含的对象不做复制.
  深复制复制全部，包括对象的属性和其他对象.
  Foundation框架支持复制的类，默认是浅复制
• 对象的自定义拷贝
  对象拥有复制特性，必须实现NSCopying，NSMutableCopying协议，实现该协议的copyWithZone方法和mutableCopyWithZone方法.
  深拷贝和浅拷贝的区别就在于copyWithZone方法的实现
  object_dispose(objTest);//等价于[objTest release];此方法只是对runtime的封装.
  再次执行 [objTest release]都晓得报的什么错误;

list：TestRuntime(1034,0x111b66300) malloc: * error for object 0x7ffe1a75b940: pointer being freed was not allocated

更改对象的类／获取对象的类

• 更改对象的类

TsetClass *obj1 = [TsetClass new]; 
Class aClass =object_setClass(obj1, [CustomClassOther class]);

(lldb)po obj1
<CustomClassOther: 0x7f8e4bd14480>

(lldb) po aClass
TsetClass
有没有出乎你的想象0.0.

• 获取对象的类

TsetClass *obj2 = [TsetClass new];
Class aLogClass =object_getClass(obj2);

(lldb) po aLogClass
TsetClass

NSString *className = [NSStringstringWithCString:object_getClassName(obj2)encoding:NSUTF8StringEncoding];
NSLog(@"className:%@", className);

(lldb) po className
TsetClass

• 给一个类添加方法

BOOL class_addMethod(Class cls,SEL name,IMP imp,    const char *types)
TsetClass *instance = [[TsetClassalloc]init];

方法添加
class_addMethod([TsetClass class],@selector(ocMethod:), (IMP)cfunction,"i@:@");

if ([instance respondsToSelector:@selector(ocMethod:)]) {
        NSLog(@"Yes, instance respondsToSelector:@selector(ocMethod:)");
    } else
    {
        NSLog(@"Sorry");
    }
    int a = (int)[instance ocMethod:@"我是一个OC的method，C函数实现"];
    NSLog(@"a:%d", a);
    int cfunction(id self, SEL _cmd, NSString *str) {
    NSLog(@"%@", str);
    return 520;//随便返回个值
}

• 获取一个类的所有方法/所有属性

  获取一个类的所有方法

u_int count;
Method* methods= class_copyMethodList([UIViewController class], &count);
for (int i = 0; i < count ; i++) { SEL name = method_getName(methods[i]); NSString *strName = [NSString stringWithCString:sel_getName(name)encoding:NSUTF8StringEncoding]; // NSLog(@"%@",strName); }

获取一个类的所有属性

u_int count;
objc_property_t *properties=class_copyPropertyList([TsetClass class], &count);
for (int i = 0; i < count ; i++) {
    const char* propertyName =property_getName(properties[i]);
        NSString *strName = [NSString stringWithCString:propertyName encoding:NSUTF8StringEncoding];
        NSLog(@"%@",strName);
    }

• 获取全局变量的值 （myFloat 为类的一个属性变量）

float myFloatValue;
object_getInstanceVariable(self,"myFloat"(void*)&myFloatValue);
NSLog(@"%f", myFloatValue);

• 设置全局变量的值

float newValue = 10.00f;
unsigned int addr = (unsigned int)&newValue;
object_setInstanceVariable(self,"myFloat", *(float**)addr);