iOS UITextField 数字输入限制 只能输入数字和小数点，只能有两位小数

 

@interface ViewController ()<UITextFieldDelegate>
{
    BOOL isHaveDian;
}

@end

 

 1 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
 2 {
 3     if ([textField.text rangeOfString:@"."].location == NSNotFound) {
 4         isHaveDian = NO;
 5     }
 6     if ([string length] > 0) {
 7     
 8         unichar single = [string characterAtIndex:0];//当前输入的字符
 9         if ((single >= '0' && single <= '9') || single == '.') {//数据格式正确
10         
11             //首字母不能为0和小数点
12             if([textField.text length] == 0){
13                 if(single == '.') {
14                     [self showError:@"亲，第一个数字不能为小数点"];
15                     [textField.text stringByReplacingCharactersInRange:range withString:@""];
16                     return NO;
17                 }
18                 if (single == '0') {
19                     [self showError:@"亲，第一个数字不能为0"];
20                     [textField.text stringByReplacingCharactersInRange:range withString:@""];
21                     return NO;
22                 }
23             }
24             
25             //输入的字符是否是小数点
26             if (single == '.') {
27                 if(!isHaveDian)//text中还没有小数点
28                 {
29                     isHaveDian = YES;
30                     return YES;
31                     
32                 }else{
33                     [self showError:@"亲，您已经输入过小数点了"];
34                     [textField.text stringByReplacingCharactersInRange:range withString:@""];
35                     return NO;
36                 }
37             }else{
38                 if (isHaveDian) {//存在小数点
39                 
40                     //判断小数点的位数
41                     NSRange ran = [textField.text rangeOfString:@"."];
42                     if (range.location - ran.location <= 2) {
43                         return YES;
44                     }else{
45                         [self showError:@"亲，您最多输入两位小数"];
46                         return NO;
47                     }
48                 }else{
49                     return YES;
50                 }
51             }
52         }else{//输入的数据格式不正确
53             [self showError:@"亲，您输入的格式不正确"];
54             [textField.text stringByReplacingCharactersInRange:range withString:@""];
55             return NO;
56         }
57     }
58     else
59     {
60         return YES;
61     }
62 }

 

1 - (void)showError:(NSString *)errorString
2 {
3     [(AppDelegate *)[UIApplication sharedApplication].delegate showErrorView:errorString];
4     [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(removeErrorView2) userInfo:nil repeats:NO];
5     
6     [self.moneyTf resignFirstResponder];
7 }

 

posted on 2016-01-14 17:24  codemaker313  阅读(2134)  评论(0)  编辑  收藏  举报

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