不废话,直接上代码!
由于不确定限制位数,设置moneyLength属性来记录位数,初始值最大integer值,可根据自己需求设置为相应位数!
moneyLength = NSIntegerMax;
textField协议:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { if (string.length == 0) { if([textField.text isEqualToString:@"¥0."]) { textField.text = @"¥"; return NO; } if(textField.text.length == 1)return NO; if(textField.text.length == NSIntegerMax)return YES; if ([textField.text hasSuffix:@"."]) { moneyLength = NSIntegerMax; return YES; } } NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string]; //得到输入框的内容 if (([string isEqualToString:@"0"] && [toBeString isEqualToString:@"¥0"]) || ([string isEqualToString:@"."] && [toBeString isEqualToString:@"¥."])) { textField.text = @"¥0."; moneyLength = textField.text.length+2; return NO; } if ([string isEqualToString:@"."]) { if([textField.text containsString:@"."])return NO; moneyLength = toBeString.length + 2; return YES; } if ([toBeString length] > moneyLength-1) { if(textField.text.length == moneyLength) { // 可以做相应交互提示 return NO; } textField.text = [toBeString substringToIndex:moneyLength]; return NO; } return YES; }