iphone - 倒计时应用程序给出预期的 "]"错误

Question

我正在为 iPhone 和 iPad 构建我的第一个应用程序，它是一个简单的应用程序，可以倒计时给定的月、日、小时、分钟和秒。

修复了几个错误后，出现了以下错误:

Expected "]"

代码如下:

#import "ViewController.h"
@implementation ViewController
-(void)updateLabel {
    NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    int units = NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *components = [calender components:units fromDate:[NSDate date] toDate:destinationDate options:0 ];
    [dateLabel setText:[[NSString stringWithFormat:@"%d%c  %d%c  %d%c  %d%c  %d%c" , [components month], 'm' [components day], 'd' , [components hour], 'h' , [components minute], 'm' , [components second], 's' ]]; 
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    destinationDate = [[NSDate dateWithTimeIntervalSince1970:1325153549] retain];
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector (updateLabel) userInfo:nil repeats:YES];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    } else {
        return YES;
    }
}
@end

Answer 1

    [dateLabel setText:[[NSString stringWithFormat:@"%d%c  %d%c  %d%c  %d%c  %d%c" , [components month], 'm' [components day], 'd' , [components hour], 'h' , [components minute], 'm' , [components second], 's' ]]; 

不平衡的括号？