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我有一个使用键盘的 OpenGL ES 应用程序。触摸屏幕时,我可以使键盘在屏幕上弹出。如果我是正确的,每次我按下一个键,

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string 

应该调用。但事实并非如此。该应用程序最初是一个纯 OpenGL Mac 游戏,我正在尝试制作 iOS 版本,所以我没有使用情节提要。如果可能的话,我更喜欢以编程方式做所有事情。这是我的 ViewController.h 代码:

#import <GLKit/GLKit.h>
#import "KeyboardView.h"

@interface ViewController : GLKViewController {
    KeyboardView* keyBoard;
}
@end

ViewController.m 的相关部分:

- (void)viewDidLoad
{
[super viewDidLoad];
self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
if (!self.context) {
    NSLog(@"Failed to create ES context");
}
GLKView *view = (GLKView *)self.view;
view.context = self.context;
view.drawableDepthFormat = GLKViewDrawableDepthFormat24;

CGRect viewRect = CGRectMake(0, 0, 100, 100);
keyBoard = [[KeyboardView alloc] initWithFrame:viewRect];

[self setupGL];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    [self.view addSubview:keyBoard];
    [keyBoard becomeFirstResponder];
}

键盘视图.h:

#import <UIKit/UIKit.h>

@interface KeyboardView : UIView <UIKeyInput, UITextFieldDelegate> {
    UITextField *field;
}

键盘视图.m:

#import "KeyboardView.h"
@implementation KeyboardView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
    field = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 100, 10)];
    }
    return self;
}

- (void)insertText:(NSString *)text {

}

- (void)deleteBackward {

}

- (BOOL)hasText {
    return YES;
}

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSLog(@"text: %@", textField.text);
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if ([newString length] < 1) {
    return YES;
} else
    {
    textField.text = [newString length] > 1 ? [newString substringToIndex:1] : newString;
    [textField resignFirstResponder];
    return NO;
    }
}

@end

我需要能够在键盘处于活动状态时获取用户输入的每个字符。我承认,我有点困惑。我不确定我的方法是否正确,因此非常感谢您的帮助。

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1 回答 1

2

键盘文本输入不是通过UITextField's捕获的

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

它确实是通过UIKeyInput's捕获的

- (void)insertText:(NSString *)text;

我正在使用软键盘在我的 GLKView (OpenGLES) 应用程序上捕获文本,我什至根本不需要任何 UITextField

以供参考:

UIKeyInput 参考文档

编辑:

你需要调用你的键盘视图becomeFirstResponder来显示你的键盘并调用resignFirstResponder隐藏它

您还需要覆盖canBecomeFirstResponder并返回TRUE

于 2016-12-01T07:19:09.467 回答