屏幕随着键盘向上移动

#pragma mark - 屏幕上弹

-( void )textFieldDidBeginEditing:(UITextField *)textField

{

//键盘高度216

//滑动效果（动画）

NSTimeInterval animationDuration = 0.50f;

[UIView beginAnimations:@"ResizeForKeyboard"  context:nil];

[UIView setAnimationDuration:animationDuration];

//将视图的Y坐标向上移动，以使下面腾出地方用于软键盘的显示

self.view.frame = CGRectMake(0.0f, -kHeightScale*150, self.view.frame.size.width, self.view.frame.size.height); //64-216

[UIView commitAnimations];

}

#pragma mark -屏幕恢复

-( void )textFieldDidEndEditing:(UITextField *)textField

{

//滑动效果

NSTimeInterval animationDuration = 0.50f;

[UIView beginAnimations:@"ResizeForKeyboard"  context:nil];

[UIView setAnimationDuration:animationDuration];

//恢复屏幕

self.view.frame = CGRectMake(0.0f, 64.0f, self.view.frame.size.width, self.view.frame.size.height); //64-216

[UIView commitAnimations];

}

//限制输入字符

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

NSMutableString * futureString = [NSMutableString stringWithString:textField.text];

[futureString  insertString:string atIndex:range.location];

NSInteger flag=0;

const NSInteger limited = 0;

for (int i = futureString.length-1; i>=0; i--) {

if ([futureString characterAtIndex:i] == '.') {

if (flag > limited) {

return NO;

}

break;

}

flag++;

}

return YES;

}