我仍在开发一款名为 Cruzia 的 iPhone 应用程序，现在想知道为什么我会在 ViewController.m 和三个错误中收到这两个警告，都是 Apple Mach-O 链接器错误。如果您能指出一些修复的方向，我将不胜感激。我已经在我的 viewcontroller.m 的副本中评论了下面的警告：
#import "CIAViewController.h"
@interface CIAViewController()
@end
@implementation CIAViewController
-(IBAction)press {
cruzia.hidden = 0;
textarea.hidden = 0;
playbtn.hidden = 1;
tutorialbtn.hidden = 1;
optionsbtn.hidden = 1;
trainingbtn.hidden = 1;
back.hidden = 0;
cruzia.text = @"Play";
textarea.text = @"Hello! You are playing the game of Cruzia!";
// declare defaults it is not declared elsewhere within your view controller
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// The stringForKey method returns a String and not a Boolean value
// However, if you just want to check if a value exists then it is implied you are checking for existence
// If there is no value then it will return nil and statement will fail
// You had "== YES" outside of the parenthesis which is an illegal statement
if ([defaults stringForKey:kMusic]) {
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef =CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"click", CFSTR ("wav"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID); }
}
-(IBAction)press2 {
cruzia.hidden = 0;
textarea.hidden = 0;
playbtn.hidden = 1;
tutorialbtn.hidden = 1;
optionsbtn.hidden = 1;
trainingbtn.hidden = 1;
back.hidden = 0;
cruzia.text = @"Tutorial";
textarea.text = @"Welcome! You are watching the Cruzia tutorial!";
// declare defaults it is not declared elsewhere within your view controller
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// The stringForKey method returns a String and not a Boolean value
// However, if you just want to check if a value exists then it is implied you are checking for existence
// If there is no value then it will return nil and statement will fail
// You had "== YES" outside of the parenthesis which is an illegal statement
if ([defaults stringForKey:kMusic]) {
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef =CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"click", CFSTR ("WAV"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID); }
}
-(IBAction)press3 {
cruzia.hidden = 0;
textarea.hidden = 0;
playbtn.hidden = 1;
tutorialbtn.hidden = 1;
optionsbtn.hidden = 1;
trainingbtn.hidden = 1;
back.hidden = 0;
cruzia.text = @"Options";
textarea.text = @"Hello! You have clicked Options. Sadly, you need to open Settngs and go to the Cruzia area to get most of the options of the game.";
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef =CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"click", CFSTR ("WAV"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID);
}
-(IBAction)press4 {
cruzia.hidden = 0;
textarea.hidden = 0;
playbtn.hidden = 1;
tutorialbtn.hidden = 1;
optionsbtn.hidden = 1;
trainingbtn.hidden = 1;
back.hidden = 0;
cruzia.text = @"Training";
textarea.text = @"This is the training area. You can improve your Cruzia skills here!";
// declare defaults it is not declared elsewhere within your view controller
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// The stringForKey method returns a String and not a Boolean value
// However, if you just want to check if a value exists then it is implied you are checking for existence
// If there is no value then it will return nil and statement will fail
// You had "== YES" outside of the parenthesis which is an illegal statement
if ([defaults stringForKey:kMusic]) {
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef =CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"click", CFSTR ("WAV"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID); }
}
-(IBAction)press5 {
cruzia.hidden = 0;
textarea.hidden = 0;
playbtn.hidden = 0;
tutorialbtn.hidden = 0;
optionsbtn.hidden = 0;
trainingbtn.hidden = 0;
back.hidden = 1;
cruzia.text = @"Cruzia";
textarea.text = @"";
// declare defaults it is not declared elsewhere within your view controller
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// The stringForKey method returns a String and not a Boolean value
// However, if you just want to check if a value exists then it is implied you are checking for existence
// If there is no value then it will return nil and statement will fail
// You had "== YES" outside of the parenthesis which is an illegal statement
if ([defaults stringForKey:kMusic]) {
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef =CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"click", CFSTR ("WAV"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID); }
}
- (void)viewDidLoad
{
textarea.hidden = 1;
playbtn.hidden = 0;
tutorialbtn.hidden = 0;
optionsbtn.hidden = 0;
trainingbtn.hidden = 0;
back.hidden = 1;
cruzia.text = @"Cruzia";
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateSettings:)
name:
NSUserDefaultsDidChangeNotification object:nil];
[self setupDefaults];
}
- (void)viewDidUnload
{
[super viewDidUnload];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidFinishLaunchingNotification object:nil];
}
-(void) setupDefaults {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *violenceValue = [defaults stringForKey:kViolenceMode];
if ( violenceValue == nil ) {
NSString *pathStr = [[NSBundle mainBundle] bundlePath];
NSString *settingsBundlePath = [pathStr stringByAppendingPathComponent:@"Settings.bundle"];
NSString *finalPath = [settingsBundlePath stringByAppendingPathComponent:@"Root.plist"];
NSDictionary *settingsDictionary = [NSDictionary dictionaryWithContentsOfFile:finalPath];
NSArray *prefSpecifierArray = [settingsDictionary objectForKey:@"PreferenceSpecifiers"];
NSString *isMusicOn, *isSoundOn;
NSDictionary *prefItem;
for (prefItem in prefSpecifierArray) {
NSString *keyValue = [prefItem objectForKey:@"Key"];
id defaultValue = [prefItem objectForKey:@"DeafultValue"];
if ([keyValue isEqualToString:kSound])
{
isSoundOn = defaultValue;
}
else if ([keyValue isEqualToString:kMusic])
{
isMusicOn = defaultValue;
}
NSDictionary *appDefaults = [NSDictionary dictionaryWithObjectsAndKeys: isSoundOn, kSound, isMusicOn, kMusic, nil];
[defaults registerDefaults:appDefaults];
[defaults synchronize];
}
}
}
@end
这是一个链接，指向打开调试和输出面板时出现其他错误的地方的屏幕截图。
再次感谢，-乔治