IOS高级开发～Runtime（二）

最新推荐文章于 2025-08-22 17:02:47 发布

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最新推荐文章于 2025-08-22 17:02:47 发布

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文章标签：移动开发

原文链接：http://www.cnblogs.com/q403154749/p/4037175.html

本文详细介绍了如何使用 Objective-C 获取类的所有方法和属性，包括使用 class_copyMethodList 和 class_copyPropertyList 函数，以及如何通过反射机制获取属性名。并通过实例展示了如何获取全局变量值、设置全局变量值以及判断属性类型。

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6、获取一个类的所有方法：

u_int count;

Method * methods = class_copyMethodList([CustomClass 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);

}

运行结果：

2014-10-20 11:57:27.884 runtimetest[10939:303] fun1

2014-10-20 11:57:27.886 runtimetest[10939:303] fun3

2014-10-20 11:57:27.886 runtimetest[10939:303] varTest1

2014-10-20 11:57:27.886 runtimetest[10939:303] setVarTest1:

2014-10-20 11:57:27.887 runtimetest[10939:303] varTest2

2014-10-20 11:57:27.887 runtimetest[10939:303] setVarTest2:

2014-10-20 11:57:27.887 runtimetest[10939:303] varTest3

2014-10-20 11:57:27.888 runtimetest[10939:303] setVarTest3:

//获取一个类的所有属性

u_int count;

objc_property_t * properties = class_copyPropertyList([CustomClass 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);

}

运行结果：

2014-10-20 12:01:23.508 runtimetest[11167:303] varTest1

2014-10-20 12:01:23.510 runtimetest[11167:303] varTest2

2014-10-20 12:01:23.510 runtimetest[11167:303] varTest3

8、获取／设置类的属性变量

//获取全局变量的值（myFloat 为类的一个属性变量）

- (void) getInstanceVar {

float myFloatValue;

object_getInstanceVariable(self,"myFloat", (void*)&myFloatValue);

NSLog(@"%f", myFloatValue);

}

//设置全局变量的值

- (void) setInstanceVar {

float newValue = 10.00f;

unsigned int addr = (unsignedint)&newValue;

object_setInstanceVariable(self,"myFloat", *(float**)addr);

NSLog(@"%f", myFloat);

}

9、判断类的某个属性的类型

- (void) getVarType {

ClassCustomClass *obj = [ClassCustomClassnew];

Ivar var = class_getInstanceVariable(object_getClass(obj),"varTest1");

const char* typeEncoding =ivar_getTypeEncoding(var);

NSString *stringType = [NSStringstringWithCString:typeEncodingencoding:NSUTF8StringEncoding];

if ([stringType hasPrefix:@"@"]) {

// handle class case

NSLog(@"handle class case");

} else if ([stringTypehasPrefix:@"i"]) {

// handle int case

NSLog(@"handle int case");

} else if ([stringTypehasPrefix:@"f"]) {

// handle float case

NSLog(@"handle float case");

} else

{

}

10、通过属性的值来获取其属性的名字（反射机制）

- (NSString *)nameOfInstance:(id)instance

{

unsigned int numIvars =0;

NSString *key=nil;

//Describes the instance variables declared by a class.

Ivar * ivars = class_copyIvarList([ClassCustomClassclass], &numIvars);

for(int i = 0; i < numIvars; i++) {

Ivar thisIvar = ivars[i];

const char *type =ivar_getTypeEncoding(thisIvar);

NSString *stringType = [NSStringstringWithCString:typeencoding:NSUTF8StringEncoding];

//不是class就跳过

if (![stringType hasPrefix:@"@"]) {

continue;

}

//Reads the value of an instance variable in an object. object_getIvar这个方法中，当遇到非objective-c对象时，并直接crash

if ((object_getIvar(allobj, thisIvar) == instance)) {

// Returns the name of an instance variable.

key = [NSStringstringWithUTF8String:ivar_getName(thisIvar)];

break;

}

free(ivars);

return key;

}

测试代码：

allobj = [ClassCustomClassnew];

allobj.varTest1 =@"varTest1String";

allobj.varTest2 =@"varTest2String";

allobj.varTest3 =@"varTest3String";

NSString *str = [selfnameOfInstance:@"varTest1String"];

NSLog(@"str:%@", str);

打印结果：

2013-07-26 16:26:26.271 HighOC[7081:c07] str:varTest1

转载于:https://www.cnblogs.com/q403154749/p/4037175.html