isEqualToString:[NSString stringWithFormat:@"_%@",key]]) { return object_getIvar(self, ivars isEqualToString:[NSString stringWithFormat:@"%@",key]]) { return object_getIvar(self, ivars [i]); } } free(ivars); return nil; } - (void)wt_setValue:(nullable id)value forKey [i], value); free(ivars); return; } } for (int i = 0; i < count [i], value); free(ivars); return; } } for (int i = 0; i < count
归档调用方法 - (void)encodeWithCoder:(NSCoder *)aCoder { // 获取所有成员变量 unsigned int outCount = 0; Ivar *ivars class_copyIvarList([self class], &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars forKey:key]; // 这两步就相当于以前的 self.age = [aDecoder decodeObjectForKey:@"_age"]; } free(ivars value = [aDecoder decodeObjectForKey:key]; [self setValue:value forKey:key]; } free(ivars = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList([self
, &outCount); // 遍历所有成员变量 for (int i = 0; i < outCount; i++) { // 取出i位置对应的成员变量 Ivar ivar = ivars free(ivars); 案例2:利用runtime 获取所有属性来重写归档解档方法 // 设置不需要归解档的属性 - (NSArray *)ignoredNames { return @[@" // 这两步就相当于以前的 self.age = [aDecoder decodeObjectForKey:@"_age"]; } free(ivars (void)encodeWithCoder:(NSCoder *)aCoder { // 获取所有成员变量 unsigned int outCount = 0; Ivar *ivars ([self class], &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars
,所以我们可以利用RunTime获取所有属性 - (void)getIvars { unsigned int count = 0; // 拷贝出所胡的成员变量列表 Ivar *ivars self class], &count); for (int i = 0; i<count; i++) { // 取出成员变量 Ivar ivar = ivars ivar_getTypeEncoding(ivar)); NSLog(@"---------------------------------------"); } // 释放 free(ivars ); } 假如我们要访问privateName属性,代码如下 unsigned int count = 0; Ivar *ivars = class_copyIvarList([TestObject class], &count); //对私有变量的更改 Ivar privateNameIvar = ivars[2]; object_setIvar(obj, privateNameIvar
获取所有的成员变量 unsigned int count = 0; // 拷贝出所胡的成员变量列表 Ivar *ivars = class_copyIvarList([UITextField class], &count); for (int i = 0; i<count; i++) { // 取出成员变量 Ivar ivar = *(ivars + i); ivar)); // 打印成员变量的数据类型 LXFLog(@"%s", ivar_getTypeEncoding(ivar)); } // 释放 free(ivars ); Swift的写法如下 var count: UInt32 = 0 let ivars = class_copyIvarList(UIViewController.self, &count)! <count { let namePoint = ivar_getName(ivars[Int(i)])!
DWExchangeTwoMethod class], &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList(c, &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars[i]; = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList(c, &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars[i];
free(ivars); 案例2:利用runtime 获取所有属性来重写归档解档方法 // 设置不需要归解档的属性 - (NSArray *)ignoredNames { return @[@"_aaa = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList(c, &outCount); = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList([self class], & = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList(c, &outCount); = [NSObject class]) { unsigned int outCount = 0; Ivar *ivars = class_copyIvarList(c, &outCount);
implementation Person - (void)encodeWithCoder:(NSCoder *)aCoder{ //属性的个数 unsigned int count = 0; Ivar * ivars class_copyIvarList([Person class], &count); for (int i = 0; i < count; i++) { //取出对应的Ivar Ivar ivar = ivars NSCoder *)aDecoder{ self = [super init]; if (self) { //属性的个数 unsigned int count = 0; Ivar * ivars class_copyIvarList([Person class], &count); for (int i = 0; i < count; i++) { //取出对应的Ivar Ivar ivar = ivars
对视频中讲到的几个点做验证: 1.class_ro_t 存储着 Flags,Size,Name,Methods,Protocols,Ivars,Properties。 class_ro_t 中有 Flags,Size,Name,Methods,Protocols,Ivars,Properties 的成员变量,但是 baseProtocols 为nil,我们向 SHPreson 二、class_ro_t 的 ivars 我们先来看一下class_ro_t 的 ivars 中都有什么: 确实有 SHPerson 中的四个成员变量,那如果我们在分类中添加属性或者成员变量,class_ro_t 的 ivars 和 baseProperties 是否也会存储呢?
So this can be used to emulate restricted access for your ivars and methods. categories primarily because extensions may declare storage (e.g. properties which will produce backing ivars
[self getIvars]; } // 获取私有变量名称 + (void)getIvars { unsigned int count = 0; Ivar *ivars class_copyIvarList([UITextField class], &count); for (int i = 0; i < count; i++) { Ivar ivar = ivars [self getIvars]; } // 获取私有变量名称 + (void)getIvars { unsigned int count = 0; Ivar *ivars class_copyIvarList([UITextField class], &count); for (int i = 0; i < count; i++) { Ivar ivar = ivars
implementation: - (void)dealloc { [_count release]; [super dealloc]; } Objective-C init/dealloc:拯救 ivars 在 init 中,所有 ivars 都已建立。在 dealloc 中,没有一个 ivars 被销毁。 但您仍需谨慎行事,并认识到自己在对象生命周期中的位置。仅仅创建一个对象并不能开始任何繁重的工作。
info.name] = info; } free(properties); } unsigned int ivarCount = 0; Ivar *ivars 0; i < ivarCount; i++) { YYClassIvarInfo *info = [[YYClassIvarInfo alloc] initWithIvar:ivars [i]]; if (info.name) ivarInfos[info.name] = info; } free(ivars); } YYModel 对示例变量做了一层封装,封装成了YYClassIvarInfo YYClassIvarInfo *info = [[YYClassIvarInfo alloc] initWithIvar:ivars [i]]; if (info.name) ivarInfos[info.name] = info; } free(ivars); }
instance_size OBJC2_UNAVAILABLE; struct objc_ivar_list * _Nullable ivars name; method_list_t * baseMethodList; protocol_list_t * baseProtocols; const ivar_list_t * ivars baseMethodList,baseProtocols,ivars,baseProperties三个都是一位数组。 总结 ogjc_class的整体内部结构如下: ?
appDelegateClassName);} main.cpp相关代码: truct AppDelegate_IMPL { struct UIResponder_IMPL UIResponder_IVARS appDelegateClassName);} 2、clang编译后: struct AppDelegate_IMPL { struct UIResponder_IMPL UIResponder_IVARS NSObject <NSObject> {#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wobjc-interface-ivars
class] accessInstanceVariablesDirectly]) { unsigned int outCount = 0; ///获取实例变量列表 Ivar *ivars NSMutableArray arrayWithCapacity:2]; for (int i = 0; i < outCount; i++) { Ivar ivar = ivars stringWithCString:pName encoding:NSUTF8StringEncoding]; [is addObject:name]; } free(ivars accessInstanceVariablesDirectly]) { unsigned int outCount = 0; ///获取实例变量列表 Ivar *ivars NSMutableArray alloc] init]; for (int i = 0; i < outCount; i++) { Ivar ivar = ivars
appDelegateClassName); } main.cpp相关代码: struct AppDelegate_IMPL { struct UIResponder_IMPL UIResponder_IVARS appDelegateClassName); } 2、clang编译后: struct AppDelegate_IMPL { struct UIResponder_IMPL UIResponder_IVARS NSObject <NSObject> { #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wobjc-interface-ivars
修改原来的点为自己的图片 func runtime() { // 利用runtime 遍历出pageControl的所有属性 var count : UInt32 = 0 let ivars <count { let ivar = ivars?[Int(i)] let name = ivar_getName(ivar!)
NSObject <NSObject> { #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wobjc-interface-ivars main-arm64.cpp 我们可以发现在生成的C++文件内,Student类的实现是如下格式 struct Student_IMPL { struct NSObject_IMPL NSObject_IVARS ; int _no; int _age; }; 这其中包含的struct NSObject_IMPL NSObject_IVARS;是指NSObject的实现,由于NSObject的实现里面只有一个 注意 : 不是12个字节 Student对象的实现 struct Student_IMPL { struct Person_IMPL Person_IVARS; int _no; };
NSMutableArray *mArray = [NSMutableArray arrayWithCapacity:1]; unsigned int count = 0; Ivar *ivars = class_copyIvarList([self class], &count); for (int i = 0; i<count; i++) { Ivar ivar = ivars ivarNameChar]; NSLog(@"ivarName == %@",ivarName); [mArray addObject:ivarName]; } free(ivars