Iphone 问题1：加入一个“$&引用；给小费计算器

我正在尝试在我的应用程序的提示结果中添加“$”，但遇到了一些困难。我在Xcode和Objective-C旁边，我不确定需要将符号放在哪里，因为它会导致错误。下面是我的.m代码的副本

非常感谢您的帮助

#import "tipcalcViewController.h"

@implementation tipcalcViewController


- (void)dealloc
{

    [super dealloc];
}
- (IBAction)aSliderChanged:(id)sender {
    UISlider *slider = (UISlider *)sender;
    if (slider == tipslide) {
        NSString *tip = [NSString stringWithFormat:@"%.2f", slider.value * 100];
        int tipPercentage = [tip intValue];
        NSString *multiplier;
        if (tipPercentage < 10) {
            multiplier = [NSString stringWithFormat:@"1.0%i", tipPercentage];
        }
        else if (tipPercentage >= 10) {
            multiplier = [NSString stringWithFormat:@"1.%i", tipPercentage];
        }
        [costWithTipLabel setText:[NSString stringWithFormat:@"%.2f", ([[costWithoutTip text] intValue] * [multiplier floatValue])]];
        [tipTextLabel setText:[[NSString stringWithFormat:@"Tip(%i", tipPercentage] stringByAppendingString:@"%):"]];
        [self performSelector:@selector(updateNumOfPeop)];
    }
    else if (slider == peopleslide) {
        NSString *p = [NSString stringWithFormat:@"%.f", slider.value*10];   
        int numberOfPeople = [p intValue];
        [numberOfPeopleTextLabel setText:[NSString stringWithFormat:@"Each(%i):", numberOfPeople]];
        [numberOfPeopleLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]/numberOfPeople]];
    }
    [totalBillCost setText:[costWithTipLabel text]];
}
- (void)updateNumOfPeop {
    NSString *p = [NSString stringWithFormat:@"%.f", peopleslide.value*10];   
    int numberOfPeople = [p intValue];
    [numberOfPeopleTextLabel setText:[NSString stringWithFormat:@"Each(%i):", numberOfPeople]];
    [numberOfPeopleLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]/numberOfPeople]];
}
/*
- (IBAction)aSliderChanged:(id)sender {
    UISlider *slider = (UISlider *)sender;
    if (slider == tipslide) {
        NSString *tip = [NSString stringWithFormat:@"%.f", slider.value * 100];
        float tipPercentage = [tip floatValue];
        NSString *multiplier = [NSString stringWithFormat:@"1.%.f", tipPercentage];
        [costWithTipLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithoutTip text] floatValue] * [multiplier floatValue]]];
        [tipTextLabel setText:[[NSString stringWithFormat:@"Tip (%.f", slider.value *100]stringByAppendingString:@"%):"]];
    }
    else if (slider == peopleslide) {
        NSString *p = [NSString stringWithFormat:@"%.f", slider.value*10];
        float numOfPeople = [p floatValue];
        [numberOfPeopleTextLabel setText:[NSString stringWithFormat:@"Each (%.f):", numOfPeople]];
        [numberOfPeopleLabel setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]/numOfPeople]];
    }
    [totalBillCost setText:[NSString stringWithFormat:@"%.2f", [[costWithTipLabel text] floatValue]]];
}
*/
- (void)viewDidLoad {
    [costWithoutTip becomeFirstResponder];
    [costWithoutTip setDelegate:self];
    [costWithoutTip setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
    [tipslide setValue:0.01];
    [peopleslide setValue:0.1];
    [super viewDidLoad];
}
- (void)textFieldDidEndEditing:(UITextField *)textField {
    [costWithoutTip setText:[NSString stringWithFormat:@"%.2f", [costWithoutTip text].floatValue]];
    [costWithoutTip resignFirstResponder];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [costWithoutTip resignFirstResponder];
    return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    [costWithoutTip resignFirstResponder];
    return YES;
}
- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
}
*/

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

#导入“tipcalcViewController.h”
@tipcalcViewController的实现
-（无效）解除锁定
{
[super dealoc]；
}
-（iAction）aSliderChanged:（id）发送方{
UISlider*滑块=（UISlider*）发送器；
如果（滑块==倾斜滑块）{
NSString*tip=[NSString stringWithFormat:@“%.2f”，slider.value*100]；
int-tipPercentage=[tip-intValue]；
NSString*乘法器；
如果（倾斜度<10）{
乘数=[NSString stringWithFormat:@“1.0%i”，TipperEntage]；
}
否则，如果（tipPercentage>=10）{
乘数=[NSString stringWithFormat:@“1.%i”，TipperEntage]；
}
[costWithTipLabel setText:[NSString stringWithFormat:@“%.2f”，（[[CostWithWithOutTip text]intValue]*[multiplier floatValue]）；
[tipTextLabel setText:[NSString stringWithFormat:@“Tip（%i”，TipperEntage]stringByAppendingString:@“%”：“]；
[自执行选择器：@selector（updateEnumofPeop）]；
}
else if（滑块==人滑块）{
NSString*p=[NSString stringWithFormat:@“%.f”，slider.value*10]；
int numberOfPeople=[p intValue]；
[numberOfPeopleTextLabel setText:[NSString stringWithFormat:@“每个（%i）：”，numberOfPeople]；
[numberOfPeopleLabel setText:[NSString stringWithFormat:@“%.2f”，[[costWithTipLabel text]floatValue]/numberOfPeople]]；
}
[totalBillCost setText:[costWithTipLabel text]；
}
-（void）updateEnumofPeop{
NSString*p=[NSString stringWithFormat:@“%.f”，peopleslide.value*10]；
int numberOfPeople=[p intValue]；
[numberOfPeopleTextLabel setText:[NSString stringWithFormat:@“每个（%i）：”，numberOfPeople]；
[numberOfPeopleLabel setText:[NSString stringWithFormat:@“%.2f”，[[costWithTipLabel text]floatValue]/numberOfPeople]]；
}
/*
-（iAction）aSliderChanged:（id）发送方{
UISlider*滑块=（UISlider*）发送器；
如果（滑块==倾斜滑块）{
NSString*tip=[NSString stringWithFormat:@“%.f”，slider.value*100]；
浮动TipperEntage=[tip floatValue]；
NSString*乘数=[NSString stringWithFormat:@“1.%.f”，tipPercentage]；
[costWithTipLabel setText:[NSString stringWithFormat:@“%.2f”，[[costWithoutTip text]浮点值]*[乘数浮点值]]；
[tipTextLabel setText:[NSString stringWithFormat:@“Tip（%.f”，slider.value*100]stringByAppendingString:@“%”：“]；
}
else if（滑块==人滑块）{
NSString*p=[NSString stringWithFormat:@“%.f”，slider.value*10]；
float numOfPeople=[p floatValue]；
[numberOfPeopleTextLabel setText:[NSString stringWithFormat:@“Each（%.f）：”，numOfPeople]；
[numberOfPeopleLabel setText:[NSString stringWithFormat:@“%.2f”，[[costWithTipLabel text]floatValue]/numOfPeople]]；
}
[totalBillCost setText:[NSString stringWithFormat:@“%.2f”，[costWithTipLabel text]floatValue]]；
}
*/
-（无效）viewDidLoad{
[无需成为第一响应者的成本]；
[CostWithout Tip setDelegate:self]；
[无提示设置键盘类型的成本：UIKeyboardTypeNumbers和标点符号]；
[tipslide设定值：0.01]；
[peopleslide设定值：0.1]；
[超级视图下载]；
}
-（void）textfielddidediting:（UITextField*）textField{
[costWithoutTip设置文本：[NSString stringWithFormat:@“%.2f”，[costWithoutTip文本].floatValue]；
[无TIP辞职的成本第一响应者]；
}
-（BOOL）textField应返回：（UITextField*）textField{
[无TIP辞职的成本第一响应者]；
返回YES；
}
-（BOOL）textField应取消编辑：（UITextField*）textField{
[无TIP辞职的成本第一响应者]；
返回YES；
}
-（无效）未收到记忆警告
{
//如果视图没有superview，则释放该视图。
[超级记忆警告]；
//释放所有未使用的缓存数据、图像等。
}
#pragma标记-视图生命周期
/*
//实现viewDidLoad以在加载视图（通常从nib）后执行附加设置。
-（无效）viewDidLoad
{
[超级视图下载]；
}
*/
-（无效）视图卸载
{
[超级视频下载]；
//释放主视图的所有保留子视图。
//例如，self.myOutlet=nil；
}
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation
{
//对于支持的方向返回YES
返回（interfaceOrientation==UIInterfaceOrientationGraphic）；
}
@结束

如果您试图格式化货币，请使用NSNumberFormatter

NSNumber *someMoney = [NSNumber numberWithFloat:5.95];

NSNumberFormatter *currencyFormatter = [[NSNumberFormatter alloc] init];
[currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

NSString *formattedAsDollars = [currencyFormatter stringFromNumber:someMoney];
[currencyFormatter release];

---

如果你感到勇敢，你甚至可以冒险进入NSDecimalNumber的世界。

请在嵌入代码时使用适当的标记格式：有一件事我可以肯定，问题不在

/*viewDidLoad*/

或

shouldAutorotateToInterfaceOrientation:

之内。您甚至没有试图通过删除与问题无关的代码来简化我们（回答者）的生活。stackoverflow的人不是机器，如果你向他们提问，他们会吐出答案。我只能为自己说话，但我不想回答一个提问者没有任何努力的问题。你想在哪个uilabel上显示货币符号？