- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textFiledEditChanged:)
name:@"UITextFieldTextDidChangeNotification"
object:self];
}
return self;
}
-(void)textFiledEditChanged:(NSNotification *)obj{
UITextField *textField = (UITextField *)obj.object;
NSString *toBeString = textField.text;
NSString *lang = [[UIApplication sharedApplication]textInputMode].primaryLanguage; // 键盘输入模式
if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写
UITextRange *selectedRange = [textField markedTextRange];
//获取高亮部分
UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];
// 没有高亮选择的字，则对已输入的文字进行字数统计和限制
if (!position) {
if (toBeString.length > _textNumber) {
[SVProgressHUD showErrorWithStatus:[NSString stringWithFormat:@"输入最多是%ld个字",(long)_textNumber]];
textField.text = [toBeString substringToIndex:_textNumber];
}
}
}
// 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况
else{
if (toBeString.length > _textNumber){
NSRange rangeIndex = [toBeString rangeOfComposedCharacterSequenceAtIndex:_textNumber];
if (rangeIndex.length == 1){
textField.text = [toBeString substringToIndex:_textNumber];
}
else{
NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, _textNumber)];
textField.text = [toBeString substringWithRange:rangeRange];
}
}
}
}
-(void)dealloc{
[[NSNotificationCenter defaultCenter]removeObserver:self
name:@"UITextFieldTextDidChangeNotification"
object:self];
}
