iOS8新特性扩展(Extension)应用之四——自定义键盘控件

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@protocol UITextDocumentProxy <UIKeyInput>

//输入的上一个字符

@property (nonatomic, readonly) NSString *documentContextBeforeInput;

//即将输入的一个字符

@property (nonatomic, readonly) NSString *documentContextAfterInput;

//将输入的字符移动到某一位置

- (void)adjustTextPositionByCharacterOffset:(NSInteger)offset;

@end

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- (void)viewDidLoad {

    [super viewDidLoad];

    // 设置数字键盘的UI

    //数字按钮布局

    for (int i=0; i<10; i++) {

        UIButton * btn = [UIButton buttonWithType:UIButtonTypeSystem];

        btn.frame=CGRectMake(20+45*(i%3), 20+45*(i/3), 40, 40);

        btn.backgroundColor=[UIColor greenColor];

        [btn setTitle:[NSString stringWithFormat:@"%d",i] forState:UIControlStateNormal];

        btn.tag=101+i;

        [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

        [self.view addSubview:btn];

    }

    //创建切换键盘按钮

    UIButton * change = [UIButton buttonWithType:UIButtonTypeSystem];

    change.frame=CGRectMake(200,20, 80, 40) ;

    NSLog(@"%f,%f",self.view.frame.size.height,self.view.frame.size.width);

    [change setBackgroundColor:[UIColor blueColor]];

    [change setTitle:@"切换键盘" forState:UIControlStateNormal];

    [change addTarget:self action:@selector(change) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:change];

    //创建删除按钮

    UIButton * delete = [UIButton buttonWithType:UIButtonTypeSystem];

    delete.frame=CGRectMake(200, 120, 80, 40);

    [delete setTitle:@"delete" forState:UIControlStateNormal];

    [delete setBackgroundColor:[UIColor redColor]];

    [delete addTarget:self action:@selector(delete) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:delete];

}

//删除方法

-(void)delete{

    if (self.textDocumentProxy.documentContextBeforeInput) {

        [self.textDocumentProxy deleteBackward];

    }

}

//切换键盘方法

-(void)change{

    [self advanceToNextInputMode];

}

//点击数字按钮 将相应数字输入

-(void)click:(UIButton *)btn{

    [self.textDocumentProxy insertText:[NSString stringWithFormat:@"%ld",btn.tag-101]];

}