iOS开篇——UI之UITextView

创建UITextView

//创建一个单例对象 存储_str字符串
    NSUserDefaults * hd = [NSUserDefaults standardUserDefaults];
    
    _str = [hd objectForKey:@"str"];
    
    UITextView * textView = [[UITextView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];
    
    textView.delegate = self;
    textView.tag = 1;
    textView.text = _str;
    textView.textColor = [UIColor redColor];
    
    textView.textAlignment  = NSTextAlignmentCenter;
    
    textView.font = [UIFont systemFontOfSize:20];
    
    textView.backgroundColor = [UIColor grayColor];
    
    //设置边框
    textView.layer.borderWidth = 1;
    
    //设置禁止编辑
//    textView.editable = NO;
    [self.view addSubview:textView];

实现UITextViewDelegate代理方法

#pragma mark - UITextViewDelegate

//将要开始编辑
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
    
    return YES;
}

//将要结束编辑
- (BOOL)textViewShouldEndEditing:(UITextView *)textView{
    //返回yes 可以退出编辑  返回NO 不可以退出编辑
    return YES;
}


//已经开始编辑
- (void)textViewDidBeginEditing:(UITextView *)textView{
    NSLog(@"已经开始编辑");
}
//已经结束编辑
- (void)textViewDidEndEditing:(UITextView *)textView{
    
    //可在此存储编辑的文字
    NSLog(@"已经结束编辑");
    _str = textView.text;
    
    NSUserDefaults * hd = [NSUserDefaults standardUserDefaults];
    [hd setObject:_str forKey:@"str"];
    
    //写入磁盘里  沙盒目录下
    [hd synchronize];
}

取消UITextView的第一响应者

//点击屏幕触发此方法
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //取消textView的第一响应者
    
    UITextView * tv = [self.view viewWithTag:1];
    
    [tv resignFirstResponder];
//    [tv becomeFirstResponder];
}