键盘遮挡输入框的问题

#import "ViewController.h"

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,UITextFieldDelegate>
@property(nonatomic,strong)UITableView *tableView;//自定义表格TableView
@end

@implementation ViewController

1 - (void)viewDidLoad {
2     [super viewDidLoad]; 4     self.tableView = [[UITableView alloc] initWithFrame:[UIScreen mainScreen].bounds style:UITableViewStylePlain];
5     self.tableView.delegate = self;
6     self.tableView.dataSource  = self;
7     [self.view addSubview:self.tableView];
8
9     //键盘将要显示时候的通知
10     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boardWillShow:) name:UIKeyboardWillShowNotification object:nil];
11      //键盘将要结束时候的通知
12     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boardDidHide:) name:UIKeyboardDidHideNotification object:nil];
13 }

1 -(void)boardWillShow:(NSNotification *)sender{
2     //获得键盘的尺寸
3     CGRect keyBoardRect=[sender.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
4     //当键盘将要显示时，将tableView的下边距增跟改为键盘的高度
5     self.tableView.contentInset = UIEdgeInsetsMake(0, 0, keyBoardRect.size.height, 0);
6 }
7
8 -(void)boardDidHide:(NSNotification *)sender{
9     //当键盘将要消失时，边距还原初始状态
10     self.tableView.contentInset = UIEdgeInsetsZero;
11 }

1 -(BOOL)textFieldShouldReturn:(UITextField *)textField{
2     //取消当前输入框的第一响应者
3      [textField resignFirstResponder];
4     return YES;
5 }

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 15;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *ider = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ider];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ider];
}

UITextField *TF = [[UITextField alloc] initWithFrame:CGRectMake(100, 5, 150, 20)];
TF.placeholder = @"请输入";
TF.delegate =self; //文本框添加代理
[cell.contentView addSubview:TF];
cell.textLabel.text = @"测试";

return cell;
}
@end