键盘遮挡输入框的问题

1.在ViewController.m文件声明

#import "ViewController.h"

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic ,strong) UITableView *tableView;
@end

2.初始化及添加通知观察者

- (void)viewDidLoad {
[super viewDidLoad];
self.tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 50, self.view.frame.size.width, self.view.frame.size.height - 50)];
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.view addSubview:self.tableView];

//键盘将要显示时候的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boardWillShow:) name:UIKeyboardWillShowNotification object:nil];

//键盘将要结束时候的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boardDidHide:) name:UIKeyboardDidHideNotification object:nil];
}

3.实现通知的响应方法

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

4.tableView的代理方法

#pragma mark - UITableViewDelegate
#pragma mark - UITableViewDataSource
-(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";
[cell.contentView addSubview:TF];
cell.textLabel.text = @"测试";
return cell;
}