-1

我遇到了很多关于同一个文件的问题，在清除了我的其他错误之后，我似乎仍然无法弄清楚。我认为错误是我有一个太多/很少 { 或 } 但在尝试了多种变化之后，我被卡住了。

我真的很感激第二次关注这个......谢谢！

下面立即显示有问题的部分，错误显示在 { else }

- (IBAction)digitPressed:(UIButton *)sender
{
    NSString *digit = sender.currentTitle;
    if (self.userIsInTheMiddleOfEnteringANumber); {
      self.display.text = [self.display.text stringByAppendingString:digit];
    } else {
        self.display.text = digit;
        self.userIsInTheMiddleOfEnteringANumber = YES;
    }
}

完整的文件插入打击

#import "CalculatorViewController.h"
#import "CalculatorBrain.h"

@interface CalculatorViewController ()
@property (nonatomic) BOOL userIsInTheMiddleOfEnteringANumber;
@property (nonatomic, strong) CalculatorBrain *brain;
@end

@implementation CalculatorViewController

@synthesize display = _display;
@synthesize userIsInTheMiddleOfEnteringANumber = _userIsInTheMiddleOfEnteringANumber;
@synthesize brain = _brain;

- (CalculatorBrain *)brain
{
    if (!_brain) _brain = [[CalculatorBrain alloc] init];
    return _brain;
}
- (IBAction)digitPressed:(UIButton *)sender
{
    NSString *digit = sender.currentTitle;
    if (self.userIsInTheMiddleOfEnteringANumber); {
      self.display.text = [self.display.text stringByAppendingString:digit];
    } else {
        self.display.text = digit;
        self.userIsInTheMiddleOfEnteringANumber = YES;
    }
}

- (IBAction)enterPressed
{
    [self.brain pushOperand:[self.display.text doubleValue]];
        self.userIsInTheMiddleOfEnteringANumber = NO;
}

- (IBAction)operationPressed:(UIButton *)sender
{
    if (self.userIsInTheMiddleOfEnteringANumber) [self enterPressed];
    double result = [self.brain performOperation:sender.currentTitle];

    NSString *resultString = [NSString stringWithFormat:@"%g", result];
    self.display.text = resultString;
}

@end
4

2 回答 2

2

您在此行上有一个额外的分号：

if (self.userIsInTheMiddleOfEnteringANumber); {
于 2012-08-11T00:43:25.620 回答
1

看起来你有“;” 在你的 if 语句之后

if (self.userIsInTheMiddleOfEnteringANumber);
于 2012-08-11T00:45:16.097 回答