iOS - 文本视图

文本视图的使用

Text View 用于显示多行可滚动文本，可选择编辑。

重要属性

• dataDetectorTypes
• delegate
• editable
• inputAccessoryView
• inputView
• text
• textAlignment
• textColor

重要的委托方法

-(void)textViewDidBeginEditing:(UITextView *)textView
-(void)textViewDidEndEditing:(UITextView *)textView
-(void)textViewDidChange:(UITextView *)textView
-(BOOL)textViewShouldEndEditing:(UITextView *)textView

添加自定义方法 addTextView

-(void)addTextView {
   myTextView = [[UITextView alloc]initWithFrame:
   CGRectMake(10, 50, 300, 200)];
   [myTextView setText:@"Lorem ipsum dolor sit er elit lamet, consectetaur
   cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et 
   dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation 
   ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
   dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat 
   nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in 
   culpa qui officia deserunt mollit anim id est laborum. Nam liber te 
   conscient to factor tum poen legum odioque civiuda.
   Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing
   pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aiqua. 
   Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi 
   aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit 
   in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
   Excepteur sint occaecat cupidatat non proident, sunt in culpa
   qui officia deserunt mollit anim id est laborum. Nam liber te conscient
   to factor tum poen legum odioque civiuda."];
   myTextView.delegate = self;
   [self.view addSubview:myTextView];
}

在 ViewController.m 中实现 textView Delegates

#pragma mark - Text View delegates

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:
   (NSRange)range replacementText:(NSString *)text {
   
   if ([text isEqualToString:@"\n"]) {
      [textView resignFirstResponder];
   }
   return YES;
}

-(void)textViewDidBeginEditing:(UITextView *)textView {
   NSLog(@"Did begin editing");
}

-(void)textViewDidChange:(UITextView *)textView {
   NSLog(@"Did Change");
}

-(void)textViewDidEndEditing:(UITextView *)textView {
   NSLog(@"Did End editing");
}

-(BOOL)textViewShouldEndEditing:(UITextView *)textView {
   [textView resignFirstResponder];
   return YES;
}

如下更新 ViewController.m 中的 viewDidLoad

(void)viewDidLoad {
   [super viewDidLoad];
   [self addTextView];
}

输出

当我们运行应用程序时，我们会得到以下输出 −

❮ iOS - UI 元素