在做一个类似QQ好友的tableView，我给表头的view加了个点击事件，用一个BOOL属性判断是否展开二级列表下面是代码

import "ProvinceAndCityController.h"

@interface ProvinceAndCityController ()
//省份数组
@property(nonatomic,strong)NSMutableArray * provinceArray;
//省份对应的城市列表
@property(nonatomic,strong)NSMutableArray * cityArray;
//是否展开二级列表
@property(nonatomic,assign)BOOL isOpen;
@end

@implementation ProvinceAndCityController

(void)viewDidLoad
{
[super viewDidLoad];

//从数据库获得省份信息
[SQLite getAllCarProvinceAndCallVack:^(id obj) {
self.provinceArray = obj;
}];
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
self.tableView.bounces = NO;
}
//有几个分区
(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.provinceArray.count;
}
//分区的行数，如果isOpen为NO就为0行
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.isOpen? self.cityArray.count:0 ;
}
//设置表头的View
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *tempV = [[UIView alloc]initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, 44)];
tempV.backgroundColor = [UIColor colorWithRed:(236)/255.0f green:(236)/255.0f blue:(236)/255.0f alpha:1];

UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(16, 2, 200, 30)];
label1.backgroundColor = [UIColor clearColor];
label1.font = [UIFont fontWithName:@"Arial" size:20];
label1.text = [self.provinceArray[section] objectForKey:@"name"];

///给section加一条线。
CALayer * separatorL = [CALayer layer];
separatorL.frame = CGRectMake(0.0f, 43.0f, [UIScreen mainScreen].bounds.size.width, 1.0f);
separatorL.backgroundColor = [UIColor lightGrayColor].CGColor;

[tempV addSubview:label1];

UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapSection:)];
tap.numberOfTapsRequired = 1;
tap.numberOfTouchesRequired = 1;
//设置tag为点击的section
tempV.tag = section;
[tempV addGestureRecognizer:tap];
[tempV.layer addSublayer:separatorL];
return tempV;
}
//点击表头触发此方法
-(void)tapSection:(UITapGestureRecognizer * )sender
{
self.isOpen = !self.isOpen;
//点击省份对应的省份ID
NSInteger ProvinceID = 1;
//根据点击的省份的ID获取对应的城市信息，数据暂时都用一个
[SQLite getCarNumByProvinceID:ProvinceID AndCallBack:^(id obj)
{
self.cityArray = obj;
}];
if (self.cityArray.count>0)
{
//刷新对应的表，就在这里崩溃，改成relodata不会崩
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:1] withRowAnimation:UITableViewRowAnimationFade];
}
}
这个是打断点后的崩溃信息截图，大神们帮忙看看是什么原因导致崩溃的吧~谢谢