iOS文本视图（Text View）

IOS文本视图的使用

文本视图用于显示多行滚动的文本。

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 中执行 textView 委托

#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;
}

修改 ViewController.m 中的 viewDidLoad方法，如下所示

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

结果输出

现在当我们运行该应用程序我们会看到下面的输出