xcode8 xib初始化崩溃

• (id)init
  {
  return [[self alloc] initWithNibName:NSStringFromClass([self class]) bundle:nil];
  }

• (id)initWithNibName:(NSString )nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
  {
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  // 防止按钮可以同时被按下
  for(UIView v in self.view.subviews)
  {
  if([v isKindOfClass:[UIButton class]])
  {
  UIButton* btn = (UIButton*)v;
  [btn setExclusiveTouch:YES];
  }
  }
  return self;
  }

在xcode8上使用这个方法初始化Controller的时候，运行就挂了，有大神能知道原因么，求指导！！！

http://www.cnblogs.com/ningmengcao-ios/p/5864264.html