UITextField 座位用户交互的一个必备使用的控件,其使用频率较高。
定义一个UITextField 及其基本的属性:
UITextField _telNum = [[UITextField alloc] init];
_telNum.clearsOnBeginEditing = NO;//在输入时不清除原来输入的文字
_telNum.delegate = self;//
[_telNum addTarget:self action:@selector(textFieldDoneEditing:) forControlEvents:UIControlEventEditingDidEndOnExit];//
_telNum.font = [UIFont boldSystemFontOfSize:14];//
_telNum.textColor = [UIColor blackColor];//
_telNum.backgroundColor = [UIColor clearColor];//
_telNum.borderStyle = UITextBorderStyleNone;
_telNum.clearButtonMode = UITextFieldViewModeWhileEditing;
_telNum.autocorrectionType = UITextAutocorrectionTypeNo;
_telNum.autocapitalizationType = UITextAutocapitalizationTypeNone;
_telNum.returnKeyType = UIReturnKeyDefault;
_telNum.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
_telNum.placeholder = @"默认的文本";
_telNum.keyboardType = UIKeyboardTypeNumberPad;//文本输入时,按键弹出的按键为数字
下面为UITextField 的一些代理方法:
1.开始输入文本时,一般需要判断键盘是否遮挡住了UITextField 视图,是的话需要调整整个视图的位置。
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
CGRect textFrame = textField.frame;
float textY = textFrame.origin.y+textFrame.size.height;
float bottomY = self.view.frame.size.height-textY;
if(bottomY<216) //判断当前的高度是否已经有216,如果超过了就不需要再移动主界面的View高度
{
float moveY = 216-bottomY;
prewMoveY = moveY;
NSTimeInterval animationDuration = 0.30f;
CGRect frame = self.view.frame;
frame.origin.y -=moveY;//view的Y轴上移
frame.size.height +=moveY; //View的高度增加
self.view.frame = frame;
[UIView beginAnimations:@"ResizeView" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];//设置调整界面的动画效果
}
return YES;
}
2. 输入文本结束时,调回输入前的视图布局-(void ) textFieldDoneEditing:(id) sender{
if (sender == _telNum) {
_payButton.enabled = YES;
NSTimeInterval animationDuration = 0.30f;
CGRect frame = self.view.frame;
//还原界面
frame.origin.y +=prewMoveY;
frame.size. height -=prewMoveY;
self.view.frame = frame;
//self.view移回原位置
[UIView beginAnimations:@"ResizeView" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
[sender resignFirstResponder];
}
}
3.决定文本输入的字数,超过一定的范围则弹出提示框:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (range.location>=11)
{
alertMessage(nil, @"超过了电话号码的长度!");
return NO;
}
else
{
return YES;
}
}
4.输入完毕,需要判定输入的文本是否满足要求,可以采用正则表达式来进行判定。例如,我们需要判定输入的数字是否为电话号码,如下代码即行:
// 正则判断手机号码地址格式
- (BOOL)isMobileNumber:(NSString *)mobileNum
{
/**
* 手机号码
* 移动:134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
* 联通:130,131,132,152,155,156,185,186
* 电信:133,1349,153,180,189
*/
NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
/**
10 * 中国移动:China Mobile
11 * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
12 */
NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
/**
15 * 中国联通:China Unicom
16 * 130,131,132,152,155,156,185,186
17 */
NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
/**
20 * 中国电信:China Telecom
21 * 133,1349,153,180,189
22 */
NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";
/**
25 * 大陆地区固话及小灵通
26 * 区号:010,020,021,022,023,024,025,027,028,029
27 * 号码:七位或八位
28 */
// NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum] == YES)
|| ([regextestcm evaluateWithObject:mobileNum] == YES)
|| ([regextestct evaluateWithObject:mobileNum] == YES)
|| ([regextestcu evaluateWithObject:mobileNum] == YES))
{
return YES;
}
else
{
return NO;
}
}
5.我们需要在点击非键盘区域实现结束输入的功能,同时键盘视图退出。可以使用如下的代码:
UIControl *controlView = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 320.0f, 416.0f)];
[controlView addTarget:self action:@selector(backgroundTap:) forControlEvents:UIControlEventTouchDown];
[self.view addSubview:controlView];
在上面的基础上增加点击消息处理方法:
-(void) backgroundTap:(id) sender{
//还原界面
NSTimeInterval animationDuration = 0.30f;
CGRect frame = self.view.frame;
frame.origin.y +=prewMoveY;
frame.size. height -=prewMoveY;
self.view.frame = frame;
//self.view移回原位置
[UIView beginAnimations:@"ResizeView" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame = frame;
[UIView commitAnimations];
[_telNum resignFirstResponder];
if(_telNum.text.length>0) {
if(![self isMobileNumber:_telNum.text]) {
alertMessage(nil, @"电话号码错误!");
}
else {
_payButton.enabled = YES;
//_payButton.hidden = NO;
}
}
}