我正在尝试编写一个小概念应用程序,当用户在 UITextView 中键入时读取字符流,并且当输入某个单词时它会被替换(有点像自动更正)。
我研究过使用 -
(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;
但到目前为止我还没有运气。谁能给我一个提示。
非常感谢!
大卫
最佳答案
这才是正确的方法。它的对象是否设置为UITextView的委托(delegate)?
更新:
- 修复了上面的“UITextView”(我之前有“UITextField”)
-添加了以下代码示例:
此方法实现位于 UITextView 的委托(delegate)对象中(例如其 View Controller 或应用程序委托(delegate)):
// replace "hi" with "hello"
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
// create final version of textView after the current text has been inserted
NSMutableString *updatedText = [[NSMutableString alloc] initWithString:textView.text];
[updatedText insertString:text atIndex:range.location];
NSRange replaceRange = range, endRange = range;
if (text.length > 1) {
// handle paste
replaceRange.length = text.length;
} else {
// handle normal typing
replaceRange.length = 2; // length of "hi" is two characters
replaceRange.location -= 1; // look back one characters (length of "hi" minus one)
}
// replace "hi" with "hello" for the inserted range
int replaceCount = [updatedText replaceOccurrencesOfString:@"hi" withString:@"hello" options:NSCaseInsensitiveSearch range:replaceRange];
if (replaceCount > 0) {
// update the textView's text
textView.text = updatedText;
// leave cursor at end of inserted text
endRange.location += text.length + replaceCount * 3; // length diff of "hello" and "hi" is 3 characters
textView.selectedRange = endRange;
[updatedText release];
// let the textView know that it should ingore the inserted text
return NO;
}
[updatedText release];
// let the textView know that it should handle the inserted text
return YES;
}
关于iphone - 替换 UITextView 中的文本,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1628422/