iPhone开发实现点击一个UIImageView时打开键盘 .

同样的需求，做Android客户端时在没有文本框时也可以通过inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);调出系统键盘。

但是，IOS中貌似没有这样的接口，所以可以采用“隐藏文本框”的方式，调出系统键盘，具体实现如下：


1、在ViewController.xib上放置一个ImageView和一个UITextField（代码中将其设置为隐藏），如下：

[img]
[img]http://dl.iteye.com/upload/attachment/0078/7385/9a396a04-af2c-3afd-b7fc-6997d443338d.png[/img]
[/img]


2、ViewController.h如下：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITextFieldDelegate>{
    BOOL hasOpenKeyBoard;//是否打开键盘
}

@property(strong,nonatomic)IBOutlet UIImageView *imgView;
@property(strong,nonatomic)IBOutlet UITextField *textField;

-(IBAction)showKeyBoard:(id)sender;
@end

3、ViewController.m如下：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize imgView;
@synthesize textField;
- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    //隐藏文本框
    textField.hidden = YES;
    //设置代理
    textField.delegate = self;
    hasOpenKeyBoard = false;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"touchesBegan...");
    //[imgView becomeFirstResponder];
    if(!hasOpenKeyBoard){
        [textField becomeFirstResponder];
    }else{
        [textField resignFirstResponder];
    }
    hasOpenKeyBoard=!hasOpenKeyBoard;
}

#pragma mark UITextFieldDelegate Methods
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    NSLog(@"string=%@",string);
    return YES;
}

@end

方法shouldChangeCharactersInRange中可以监听到键盘输入。


4、效果如下：
[img]
[img]http://dl.iteye.com/upload/attachment/0078/7387/c149a3cf-540a-383c-95ed-1cefcde541d7.png[/img]
[/img]