我制作的应用程序是一种基本风格的学生贷款计算器。我坚持的位是按钮计算。用户必须输入多个值，然后单击计算按钮，除了底部计算之外的所有内容都有效，为了解决这个问题，我必须再次按下计算按钮。
此图显示了按一次计算按钮后应用程序的样子。
此图显示了按两次计算按钮后应用程序的外观。然后计算底部计算
这是我正在使用的当前代码：
//
// ViewController.m
// Repayment Calculator
//
// Created by on 04/11/2015.
// Copyright (c) 2015. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize button1, textbox1, textbox2, textbox3, startingsalary, repaymentlabel, debtlabel, startingrepayments, timetakentopayoffloan, realtimetakentopayoffloan, debtamounttextfield, annualrepaymentstextfield, monthlyrepaymentstextfield,weeklyrepaymentstextfield, payoffloantextfield, testlabel, annualrepaymentstest, totaldebtamounttest;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
// - (IBAction)button1Press:(id)sender {
// [button1 setTitle:textbox1.text forState:UIControlStateNormal];
// }
//The start of the calculate button that starts the calculations.
-(IBAction)button1Press:(id)sender
{
int x = ([textbox1.text intValue]);
int y = ([textbox2.text intValue]);
int q = ([textbox3.text intValue]);
float startingsal = ([startingsalary.text intValue]);
int debtamounttfield = ([debtamounttextfield.text intValue]);
float annualrepayments = ([annualrepaymentstextfield.text floatValue]);
//PROBLEM STARTS
float p1 = debtamounttfield /annualrepayments;//([debtamounttextfield.text intValue]);
if(isnan(p1) || isinf(p1)){
p1 = 0.00;
}
[testlabel setText:[NSString stringWithFormat:@"%.01f",p1]];
[totaldebtamounttest setText:[NSString stringWithFormat:@"%d", debtamounttfield]];
[annualrepaymentstest setText:[NSString stringWithFormat:@"%@", annualrepaymentstextfield]];
[payoffloantextfield setText:[NSString stringWithFormat:@"%.01f", p1]];
//PROBLEM ENDS
[debtamounttextfield setText:[NSString stringWithFormat:@"%i" , (x + y) * q]];
int arp = (startingsal - 16910)*0.09;
[annualrepaymentstextfield setText:[NSString stringWithFormat:@"%i", arp ]];
[monthlyrepaymentstextfield setText:[NSString stringWithFormat:@"%f", (startingsal - 16910)*0.09/12]];
[weeklyrepaymentstextfield setText:[NSString stringWithFormat:@"%f", (startingsal - 16910)*0.09/12/4]];
//Error Handling
//Enter starting salary
if ([startingsalary.text isEqualToString: @""]) {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error"
message:@"Please enter your expected starting salary"
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
//If course length is equal to 0
if ([textbox3.text isEqualToString: @"0"]) {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error"
message:@"Your course lenth cannot be 0 Years. Please enter a different value"
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
//If course length text field is empty
if ([textbox3.text isEqualToString: @""]){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error"
message:@"Please enter your current course length"
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
//Error handling for Annual University Fee
if ([textbox1.text isEqualToString: @""]){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error"
message:@"Please enter your annual University Fee."
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
if ([textbox2.text isEqualToString: @""]){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error"
message:@"Please enter your annual maintenance loan value."
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
}
-(IBAction)clearbutton:(id)sender {
[textbox1 setText:[NSString stringWithFormat:@""]];
[textbox2 setText:[NSString stringWithFormat:@""]];
[textbox3 setText:[NSString stringWithFormat:@""]];
[startingrepayments setText:[NSString stringWithFormat:@"Loan at start of repayments: "]];
[startingsalary setText:[NSString stringWithFormat:@""]];
[realtimetakentopayoffloan setText:[NSString stringWithFormat:@""]];
[debtamounttextfield setText:[NSString stringWithFormat:@""]];
[annualrepaymentstextfield setText:[NSString stringWithFormat:@""]];
[monthlyrepaymentstextfield setText:[NSString stringWithFormat:@""]];
[weeklyrepaymentstextfield setText:[NSString stringWithFormat:@""]];
[payoffloantextfield setText:[NSString stringWithFormat:@""]];
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Cleared"
message:@"All fields have now been cleared."
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
@end
非常感谢任何可以帮助我的人。这是我现在已经停留了一段时间的事情，并希望得到解决。
答案 0 :(得分：0)
好吧我是新手，我根本不知道，但我会尽力帮助你。 英语也不是我的母语，请原谅我的错误，我会尽我所能。 所以，似乎你的数据卡在某处。我要给你的解决方案可能对你有所帮助，而且一劳永逸。 我会放置一个NSTimer，它会在所有文本字段都被填充的时间间隔内计算出很短的时间间隔，这样就可以“先按”并获得结果。 然后，“计算”按钮仅显示在标签或文本字段中（如您所愿）的结果。一旦显示，您就会使NSTimer无效，这样就不会出错。
我不知道您是否理解我，如果您对此消息有任何疑问，请与我联系。
我告诉你的代码就是这样：
//make a values int:
int valor;
//in your viewDidLoad probably:
NSTimer *intervalo = [NSTimer scheduledTimerWithTimeInterval:(1.0/3.0) target:self selector:@selector(autocalculate) userInfo:nil repeats:YES];
-(void)autocalculate{
//the code that you have in your UIButton "Calculate"
//take the result into the int valor so it can be use later
}
-(IBAction)show{
**thenameofyourtextresultstextfield**=[NSString stringWithFormat:@"%i", valor];
[intervalo invalidate];
希望有所帮助