Runtime

创建一个类

• (void)pushToAnyVCWithData:(NSDictionary *)dataDict{
  //
  const char *clsName = [dataDict[@"class"] UTF8String];
  Class cls = objc_getClass(clsName);
  // 1: 创建类
  if (!cls) {
  Class superClass = [UIViewController class];
  cls = objc_allocateClassPair(superClass, clsName, 0);
  class_addIvar(cls, "ending", sizeof(NSString *), log2(sizeof(NSString *)), @encode(NSString *));
  class_addIvar(cls, "show_lb", sizeof(UILabel *), log2(sizeof(UILabel *)), @encode(UILabel *));
  objc_registerClassPair(cls);

    Method method = class_getInstanceMethod([self class], @selector(lg_instancemethod));
    IMP methodIMP = method_getImplementation(method);
    const char *types = method_getTypeEncoding(method);
    BOOL rest = class_addMethod(cls, @selector(viewDidLoad), methodIMP, types);
    NSLog(@"rest == %d",rest);
  

  }

  // 实例化对象
  id instance = nil;
  @try {
  UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
  instance = [sb instantiateViewControllerWithIdentifier:dataDict[@"class"]];
  } @catch (NSException *exception) {

    instance = [[cls alloc] init];
  

  } @finally {
  NSLog(@"OK");
  }

  NSDictionary *dict = dataDict[@"data"];
  [dict enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
  // 检测是否存在key的属性
  if (class_getProperty(cls, [key UTF8String])) {
  [instance setValue:obj forKey:key];
  }
  // 检测是否存在key的变量
  else if (class_getInstanceVariable(cls, [key UTF8String])){
  [instance setValue:obj forKey:key];
  }
  }];

[self.navigationController pushViewController:instance animated:YES];

}

// self ?
// objc_msgSend(id self,)
// self 型参
// self class [super class]

• (void)lg_instancemethod {
  [super viewDidLoad];

  [self setValue:[UIColor orangeColor] forKeyPath:@"view.backgroundColor"];
  [self setValue:[[UILabel alloc] initWithFrame:CGRectMake(100, 200, 200, 30)] forKey:@"show_lb"];
  UILabel *show_lb = [self valueForKey:@"show_lb"];
  [[self valueForKey:@"view"] addSubview:show_lb];
  show_lb.text = [self valueForKey:@"ending"];
  show_lb.font = [UIFont systemFontOfSize:14];
  show_lb.textColor = [UIColor blackColor];
  show_lb.textAlignment = NSTextAlignmentCenter;
  show_lb.backgroundColor = [UIColor whiteColor];
  NSLog(@"hello word");
  }