ios学习笔记（四）收回软键盘的两种方式

这次讲的内容很简单：

1.首先我们还是创建一个Single View Application，然后打开MainStoryboard_iphone.storyboard,在里面放入俩lable和两个TextFiled:

2.接着开始写代码：ViewController.h:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController{
UITextField *nameField;
UITextField *numberField;
}
@property (nonatomic,retain) IBOutlet UITextField *nameField;
@property (nonatomic,retain) IBOutlet UITextField *numberField;
- (IBAction)backgroundTap:(id)sender;
- (IBAction)textFiledReturnEditing:(id)sender;
@end

ViewController.m:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize nameField;
@synthesize numberField;
- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}
//点击屏幕空白view时触发的事件
- (IBAction)backgroundTap:(id)sender{
    
    [nameField resignFirstResponder];//通知文本失去第一响应者状态
    [numberField resignFirstResponder];
}

//点击return时触发的事件ß
- (IBAction)textFiledReturnEditing:(id)sender {
    [sender resignFirstResponder];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    } else {
        return YES;
    }
}
@end

3.接着我们连接操作和输出口：

将背景view的类别设置为UIControl，这样我们就能对屏幕的事件进行处理了，将Control的touch down输出连接到backgroundTap事件上，因为点击软键盘会触发did end on exit，那我们就把两个textFiled的did end on exit输出连接到textFiledReturnEditing事件上。当然我们不要忘记将两个textFiled控件的输出与ViewController的相应控件接口连接在一起。

4.运行程序看看效果：

点击textFiled时：

点击return或点击界面空白时：