这里不能只在进行限制，在textFieldDidChange中需要对中文联想做处理才行
三. 放弃键盘
1. 能拿到uitextfield的时候用
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
return [textField resignFirstResponder];
}
2. 点击view消失的时候用
[self.view endEditing:YES];
3. 难以获取的时候用
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
或者
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];
4.Tableview点击空白处或者滚动时消失
{
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fingerTapped:)];
[self.view addGestureRecognizer:singleTap];
}
#pragma mark- 键盘消失
-(void)fingerTapped:(UITapGestureRecognizer *)gestureRecognizer{
[self.view endEditing:YES];
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
[self.view endEditing:YES];
}
四. 正则表达式限制
请参考 正则表达式语法表 ,这里我提供了两种表达式给大家参考，一个Int,一个无unsignedInt
-(BOOL) isTextFieldMatchWithRegularExpression:(NSString *)exporession{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",exporession];
return [predicate evaluateWithObject:self];
}
-(BOOL) isTextFieldIntValue{
return [self isTextFieldMatchWithRegularExpression:@"[-]{0,1}[0-9]*"];
}
-(BOOL) isTextFieldUnsignedIntValue{
return [self isTextFieldMatchWithRegularExpression:@"[0-9]+"];
}
五. UITextfield的键盘事件多次回调问题
1.键盘高度遮挡问题
一般出现遮挡的时候我们用以下代码,看看当前textfield是否在键盘下面，在的话算出键盘的顶端和textfield的底部的距离，然后做偏移动画
- (void)keyboardWillShow:(NSNotification *)notification {
NSDictionary *userInfo = [notification userInfo];
NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
keyboardRect = [self.view convertRect:keyboardRect fromView:nil];
CGFloat keyboardTop = keyboardRect.origin.y;
CGFloat offset = self.normalTextField.frame.size.height + self.normalTextField.frame.origin.y - keyboardTop;
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval animationDuration;
[animationDurationValue getValue:&animationDuration];
if(offset > 0){
// Animate the resize of the text view's frame in sync with the keyboard's appearance.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:animationDuration];
CGRect rect = CGRectMake(0.0f, -offset,self.view.frame.size.width,self.view.frame.size.height);
self.view.frame = rect;
[UIView commitAnimations];
}
}
