Objective-C Runtime是提供Objective-C语言动态特性的运行时的库。
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例子1 Runtime
例子2 Runtime message
Objective-C Runtime
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// 获取属性列表&&获取属性名称
unsigned int count;
objc_property_t *propertyList = class_copyPropertyList([self class], &count);
for (int i = 0; i < count ; i++) {
const char *propertyName = property_getName(propertyList[i]);
NSString *str = [NSString stringWithUTF8String:propertyName];
NSLog(@"property_getName==%@",str);
}
// 获取方法列表&&获取方法名称
Method *methodList = class_copyMethodList([self class], &count);
for (int i = 0; i < count; i++) {
Method method = methodList[i];
//获取方法的参数列表
int arguments = method_getNumberOfArguments(method);
NSLog(@"method_getNumberOfArguments===%d",arguments);
NSLog(@"method_getName===%@",NSStringFromSelector(method_getName(method)));
}
// 获取类成员变量列表&&获取成员变量名称
Ivar *ivarList = class_copyIvarList([self class], &count);
for (int i = 0; i < count; i++) {
Ivar ivar = ivarList[i];
NSString *ivarName = [NSString stringWithUTF8String:ivar_getName(ivar)];
NSLog(@"ivar_getName===%@",ivarName);
}
// 获取类协议列表&&获取协议名称
__unsafe_unretained Protocol **protocolList = class_copyProtocolList([self class], &count);
for (unsigned int i = 0; i < count; i++) {
Protocol *protocol = protocolList[i];
NSString *protocolStr = [NSString stringWithUTF8String:protocol_getName(protocol)];
NSLog(@"protocol_getName===%@",protocolStr);
}
// 是不是元类
BOOL isMetaClass = class_isMetaClass(self.class);
NSLog(@"ViewController is the meta class? %d", isMetaClass);
// 是不是类对象
ViewController *obj = [ViewController new];
BOOL isClass = object_isClass(obj);
NSLog(@"ViewController is the class? %d", isClass);
// 获取类名称
const char *name = class_getName(self.class);
NSLog(@"class_getName===%@",[NSString stringWithCString:name encoding:NSUTF8StringEncoding]);
// 设置关联&&获取关联
static char *key = "key";
objc_setAssociatedObject(self, &key, @"hello world", OBJC_ASSOCIATION_COPY_NONATOMIC);
NSString *associated = objc_getAssociatedObject(self, &key);
NSLog(@"objc_getAssociatedObject===%@",associated);
/*----------------------Method Swizzling------------------------*/
// 获取实例方法
Method originalMethod = class_getInstanceMethod([self class], @selector(original:));
Method exchangeMethod = class_getInstanceMethod([self class], @selector(exchange:));
// 获取方法指针
IMP exchangeImp = method_getImplementation(exchangeMethod);
IMP originalImp = method_getImplementation(originalMethod);
// 获取描述方法的参数类型
const char *originalType = method_getTypeEncoding(originalMethod);
const char *exchangeType = method_getTypeEncoding(exchangeMethod);
// 添加方法
BOOL didAddMethod = class_addMethod([self class],
@selector(original:),
exchangeImp,
exchangeType);
if (didAddMethod) {
// 替换方法
class_replaceMethod([self class],
@selector(exchange:),
originalImp,
originalType);
}else{
// Method Swizzling
method_exchangeImplementations(exchangeMethod, originalMethod);
}
/*----------------------Method Swizzling------------------------*/
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// 初始化 [[MsgSend1 alloc] init];
MsgSend1 *msg = ((MsgSend1 * (*)(id,SEL))objc_msgSend)((id)[MsgSend1 class], @selector(alloc));
msg = ((MsgSend1 * (*)(id,SEL))objc_msgSend)((id)msg, @selector(init));
// 发送无参无返回值消息
((void (*)(id,SEL))objc_msgSend)((id)msg, @selector(noArgumentsAndNoReturnValue));
// 发送有参数无返回值得消息
((void (*)(id,SEL,NSString *))objc_msgSend)((id)msg, @selector(hasArguments:),@"带参数但是无返回值");
// 带返回值不带参数消息
NSString *retValue = ((NSString * (*)(id,SEL))objc_msgSend)((id)msg,@selector(noArgumentsButReturnValue));
NSLog(@"%@",retValue);
// 带参数带返回值消息
int returnValue = ((int (*)(id,SEL,NSString *,int))objc_msgSend)((id)msg,@selector(hasValue1:Value2:),@"参数",999);
NSLog(@"return value is %d",returnValue);
// 动态添加方法再调用 其中i代表返回类型int，@代表参数，:代表SEL
class_addMethod(msg.class, NSSelectorFromString(@"cStyleFunc"), (IMP)cStyleFunc,"i@:");
returnValue = ((int (*)(id,SEL,const void *,const void *))objc_msgSend)((id)msg,NSSelectorFromString(@"cStyleFunc"),"one","two");
NSLog(@"return value is %d",returnValue);
// 带返回浮点值的消息
//objc_msgSend
//float returnFloatValue = ((float (*)(id,SEL))objc_msgSend)((id)msg,@selector(returnFloatType));
//objc_msgSend_fpret
float returnFloatValue = ((float (*)(id,SEL))objc_msgSend_fpret)((id)msg,@selector(returnFloatType));
NSLog(@"return float is %f",returnFloatValue);
// 带结构体返回值的消息
//objc_msgSend_stret
CGRect frame = ((CGRect (*)(id,SEL))objc_msgSend_stret)((id)self,@selector(returnTypeIsStruct));
NSLog(@"return frame is %@",NSStringFromCGRect(frame));