UIActionSheet中加入UITextField，键盘无法输入的问题

[不同的Me]

刚开始做IOS移动开发，遇到一些问题，希望大牛们来积极解答，主要问题就是我在UIActionSheet中加入了一个UITextField控件，点击控件的时候，可以弹出键盘，并且点击[X]键也可以删除UITextField中的内容，但是无法输入内容，网上看了一些解答主要是设置KeyWindow，代码中已经标出来，但是没有效果，还有一个小问题，就是我设置了UIActionSheet的frame之后，也没效果，代码中也标出了,下面贴上代码
.h文件

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UIActionSheetDelegate, UITextFieldDelegate>
{
    UIActionSheet * sheet;
}

@end

.m文件

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)btnClicked:(id)sender
{
    UIButton * btn = (UIButton*)sender;
    [sheet dismissWithClickedButtonIndex:btn.tag animated:YES];
}

- (void)buttonClicked:(id)sender
{
    sheet = [[UIActionSheet alloc] initWithTitle:@"爱情宣言\n\n\n\n\n\n\n\n\n" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
    
    sheet.frame = CGRectMake(0, 260, 320, 480); //不起作用，求解释？
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 100, 320, 40)];
    textField.backgroundColor = [UIColor whiteColor];
    textField.text = @"我爱景妃";
    textField.textAlignment = NSTextAlignmentCenter;
    textField.delegate = self;
    [sheet addSubview:textField];
    [textField release];
    
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(140, 150, 80, 40)];
    [btn setTitle:@"永不言弃" forState:UIControlStateNormal];
    btn.tag = 100;
    [btn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
    [sheet addSubview:btn];
    [btn release];
    
    [sheet showInView:self.view];
    [sheet release];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    UIButton * btn1 = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 80, 40)];
    [btn1 setTitle:@"Click Me" forState:UIControlStateNormal];
    [btn1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    btn1.backgroundColor = [UIColor blackColor];
    [self.view addSubview:btn1];
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc
{
    [sheet release];
    [super dealloc];
}

#pragma mark action sheet delegate method


#pragma mark textfield delegate method
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    sheet.frame = CGRectMake(0, 100, 320, 480);
    
    if (!textField.window.isKeyWindow) {             //网上很多说不是keywindow的问题，但是我改了还是无效，求高手帮忙解答，不胜感激
        [textField.window makeKeyAndVisible];
    }
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    sheet.frame = CGRectMake(0, 260, 320, 480);
    [textField resignFirstResponder];
}

@end

[不同的Me]

好几天了，有没有人遇到同样的问题啊，求讨论

[hongrisong]

断点 看UITextView的代理进入了嘛？

[不同的Me]

引用 2 楼 songhongri 的回复:

断点 看UITextView的代理进入了嘛？

进断点了，就是有注释的哪行//网上很多说不是keywindow的问题，但是我改了还是无效，求高手帮忙解答，不胜感激

[进击的马喽]

我也遇到了了，解决了么