Question

当视图加载时，我初始化两个NSMutableArray。一个用于NSStrings，另一个用于NSData：

- (void)viewDidLoad {
    [super viewDidLoad];
    highlightStrings = [[NSMutableArray alloc] initWithObjects:@"initializer", nil];
    highlightColorsData = [[NSMutableArray alloc] initWithObjects:@"initializer", nil];
}

在IBAction中，当点击按钮时，我在UITextView中获得UIButton背景颜色和所选文本。 NSString被添加到NSMutableArray，UIColor被存档到NSData并添加到NSMutableArray。两者都在NSUserDefaults中保存和检索（在此IBAction中测试它以便稍后在viewDidLoad中使用）。不幸的是，错误落在了我试图取消归档NSData以应用于另一个数组中的并行NSString的行。我已经测试了空的和未初始化的数组，所以我知道在数组中访问索引时有一个对象。错误行在for循环中靠近此块的末尾：

-(IBAction)lightGreenButtonAct:(id)sender{
    //get color
    selectedColor = [_lightGreenButton backgroundColor];

    //get selected string
    NSString *lyricsText = _lyricsPad.text;
    NSString *selectedString = [[_lyricsPad text]
                                substringWithRange:[_lyricsPad selectedRange]];

    //create mutable attributed string from all text (and range from selected string)
    NSMutableAttributedString *mutLyricsText =[[NSMutableAttributedString alloc] initWithString: lyricsText];
    NSRange selectedRange = [lyricsText rangeOfString: selectedString];

    //add color data and string to respective arrays
    [highlightStrings addObject:selectedString];
    NSData *lightGreenColorData = [NSKeyedArchiver archivedDataWithRootObject:selectedColor];
    [highlightColorsData addObject:lightGreenColorData];

    //save color data and string arrays
    NSUserDefaults *saveHighlightStrings = [NSUserDefaults standardUserDefaults];
    [saveHighlightStrings setObject:highlightStrings forKey:@"saveHighlightStringsKey"];
    [saveHighlightStrings synchronize];
    NSUserDefaults *saveHighlightColorsData = [NSUserDefaults standardUserDefaults];
    [saveHighlightColorsData setObject:highlightColorsData forKey:@"saveHighlightColorsDataKey"];
    [saveHighlightColorsData synchronize];

    //get saved color data and string arrays
    NSArray *receiveHighlightStrings = [saveHighlightStrings arrayForKey:@"saveHighlightStringsKey"];
    NSArray *receiveHighlightColorsData = [saveHighlightColorsData arrayForKey:@"saveHighlightColorsDataKey"];

    for (int i=0; i<[receiveHighlightColorsData count]; i++) {
            NSData *receiveColorData = receiveHighlightColorsData[i];
            UIColor *colorFromData = [NSKeyedUnarchiver unarchiveObjectWithData:receiveColorData];
            [mutLyricsText addAttribute:NSBackgroundColorAttributeName value:colorFromData range:[receiveHighlightStrings[i] range]];
    }

    _lyricsPad.attributedText = mutLyricsText;
}

点击浅绿色按钮时，会出现在调试器中：

2017-09-18 13:05:16.741987 Vizzy[7211:1016832] [Common] _BSMachError: port 7103; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
2017-09-18 13:05:16.742593 Vizzy[7211:1016832] [Common] _BSMachError: port 7103; (os/kern) invalid name (0xf) "Unable to deallocate send right"
2017-09-18 13:05:20.940 Vizzy[7211:1016832] -[__NSCFString bytes]: unrecognized selector sent to instance 0x60800003a340
2017-09-18 13:05:20.977 Vizzy[7211:1016832] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString bytes]: unrecognized selector sent to instance 0x60800003a340'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000107e3e34b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x000000010789f21e objc_exception_throw + 48
    2   CoreFoundation                      0x0000000107eadf34 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
    3   CoreFoundation                      0x0000000107dc3c15 ___forwarding___ + 1013
    4   CoreFoundation                      0x0000000107dc3798 _CF_forwarding_prep_0 + 120
    5   Foundation                          0x000000010736e54e -[NSKeyedUnarchiver initForReadingWithData:] + 314
    6   Foundation                          0x000000010736e36a +[NSKeyedUnarchiver unarchiveObjectWithData:] + 61
    7   Vizzy                               0x00000001072c36f0 -[ViewController lightGreenButtonAct:] + 976
    8   UIKit                               0x0000000108263b88 -[UIApplication sendAction:to:from:forEvent:] + 83
    9   UIKit                               0x00000001083e92b2 -[UIControl sendAction:to:forEvent:] + 67
    10  UIKit                               0x00000001083e95cb -[UIControl _sendActionsForEvents:withEvent:] + 444
    11  UIKit                               0x00000001083e84c7 -[UIControl touchesEnded:withEvent:] + 668
    12  UIKit                               0x00000001082d10d5 -[UIWindow _sendTouchesForEvent:] + 2747
    13  UIKit                               0x00000001082d27c3 -[UIWindow sendEvent:] + 4011
    14  UIKit                               0x000000010827fa33 -[UIApplication sendEvent:] + 371
    15  UIKit                               0x0000000108a71b6d __dispatchPreprocessedEventFromEventQueue + 3248
    16  UIKit                               0x0000000108a6a817 __handleEventQueue + 4879
    17  CoreFoundation                      0x0000000107de3311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    18  CoreFoundation                      0x0000000107dc859c __CFRunLoopDoSources0 + 556
    19  CoreFoundation                      0x0000000107dc7a86 __CFRunLoopRun + 918
    20  CoreFoundation                      0x0000000107dc7494 CFRunLoopRunSpecific + 420
    21  GraphicsServices                    0x000000010bb98a6f GSEventRunModal + 161
    22  UIKit                               0x0000000108261f34 UIApplicationMain + 159
    23  Vizzy                               0x00000001072c6b0f main + 111
    24  libdyld.dylib                       0x000000010ac1968d start + 1
    25  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Objective-C - 将NSData解压缩到UIColor会导致崩溃

0 个答案: