键盘在模式下，可能没有返回或者是完成按钮，因此有的时候需要人为的添加一个返回或者是完成按钮。

首先，创建一个工程：

@interface ViewController ()<UITextFieldDelegate>

{
    UITextField *testField;
}
@end

创建一个全局的，方便调用

在自己想要调用的方法中创建textField

- (void)viewDidLoad {

    [super viewDidLoad];
   
    testField =[[UITextField alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];
    [self.view addSubview:testField];
    testField.placeholder = @"搜索内容";
    
    
    UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
    [topView setBarStyle:UIBarStyleBlackTranslucent];
    
    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(2, 5, 50, 25);
    [btn addTarget:self action:@selector(dismissKeyBoard) forControlEvents:UIControlEventTouchUpInside];
    [btn setTitle:@"完成" forState:UIControlStateNormal];
//    [btn setImage:[UIImage p_w_picpathNamed:@"shouqi"] forState:UIControlStateNormal];
    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc]initWithCustomView:btn];
    NSArray * buttonsArray = [NSArray arrayWithObjects:btnSpace,doneBtn,nil];
    [topView setItems:buttonsArray];
    [testField setInputAccessoryView:topView];
    
    
}
-(void)dismissKeyBoard
{
    [testField resignFirstResponder];
}
这样一个简单的键盘回收demo就完成的