@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     else59     {60         return YES;61     }62 }

 

1 - (void)showError:(NSString *)errorString2 {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 }