富文本点击事件（链接）

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange {

    NSLog(@"url :%@",URL);

    if ([[URL scheme] isEqualToString:@"username"]) {

        NSString *username = [URL host];

        NSLog(@"username :%@",username);

        return NO;

    }

    return YES;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    

    NSString * str = [NSString stringWithFormat:@"This is an example by @www.apple.com/"];

    

    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:str]; // assume string exists

    NSRange urlRange = [str rangeOfString:@"www.apple.com/"];

    [string addAttribute:NSLinkAttributeName

                   value:@"username://@www.apple.com/"

                   range:urlRange];

    [string addAttribute:NSForegroundColorAttributeName

                   value:[UIColor blueColor]

                   range:urlRange];

    [string addAttribute:NSUnderlineStyleAttributeName

                   value:@(NSUnderlineStyleNone)

                   range:urlRange];

    [string endEditing];

    

    UITextView * textView = [[UITextView alloc] initWithFrame:CGRectMake(100, 200, 200, 200)];

    textView.backgroundColor =[UIColor whiteColor];

    textView.delegate = self;

    [textView setSelectable: YES];

    [textView setEditable:NO];

    textView.attributedText = string;

    textView.dataDetectorTypes = UIDataDetectorTypeLink;

    [self.view addSubview:textView];

    

}