objective-c - xcode 'NSInvalidArgumentException'，原因: '-[cure superview]: unrecognized selector sent to instance 0x4e3b7b0'

Question

我不确定为什么会收到此错误我创建了一个常规的标签栏应用程序制作了 5 个选项卡(编译和运行)然后在其中一个选项卡中放置一个表格 View ，将代码放在下面，我得到这个错误

治愈.h

#import <UIKit/UIKit.h>

@interface cure : UIViewController 
<UITableViewDataSource, UITableViewDelegate>
{
    NSArray *exercises;
}

@end

治愈.m

#import "cure.h"

@implementation cure

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    // create a cell
    if ( cell == nil) {
        cell = [[UITableViewCell alloc] 
                initWithStyle:UITableViewCellStyleDefault 
                reuseIdentifier:@"cell"];
    }

    // set the main text
    cell.textLabel.text = [exercises objectAtIndex:indexPath.row];

    // return the cell.
    return cell;
}


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    exercises = [[NSArray alloc] 
                 initWithObjects:@"An Interesting Title",
                 @"A Not That Interesting Title",
                 @"And Still Another Title", nil];

    [super viewDidLoad];
}



- (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.
}

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


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

@end

在 mainwindows.xib 中我有正确的选项卡类名称“治愈”

错误

2011-04-29 22:22:06.446 week 3 week clear [4950:40b] -[cure superview]: unrecognized selector sent to instance 0x4e3b7b0
2011-04-29 22:22:06.451 peek 3 week clear [4950:40b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[cure superview]: unrecognized selector sent to instance 0x4e3b7b0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00dc15a9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x00f15313 objc_exception_throw + 44
    2   CoreFoundation                      0x00dc30bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x00d32966 ___forwarding___ + 966
    4   CoreFoundation                      0x00d32522 _CF_forwarding_prep_0 + 50
    5   UIKit                               0x002e2365 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 77
    6   UIKit                               0x002e0aa3 -[UIView(Hierarchy) addSubview:] + 57
    7   UIKit                               0x002e87c1 -[UIView initWithCoder:] + 840
    8   Foundation                          0x00017c24 _decodeObjectBinary + 3296
    9   Foundation                          0x00016d91 _decodeObject + 224
    10  UIKit                               0x004ac979 -[UIRuntimeConnection initWithCoder:] + 212
    11  Foundation                          0x00017c24 _decodeObjectBinary + 3296
    12  Foundation                          0x000189f5 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1354
    13  Foundation                          0x00019024 -[NSArray(NSArray) initWithCoder:] + 596
    14  Foundation                          0x00017c24 _decodeObjectBinary + 3296
    15  Foundation                          0x00016d91 _decodeObject + 224
    16  UIKit                               0x004abc36 -[UINib instantiateWithOwner:options:] + 804
    17  UIKit                               0x004adab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
    18  UIKit                               0x00363628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
    19  UIKit                               0x00361134 -[UIViewController loadView] + 120
    20  UIKit                               0x0036100e -[UIViewController view] + 56
    21  UIKit                               0x00373f54 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 120
    22  UIKit                               0x00372aaa -[UITabBarController transitionFromViewController:toViewController:] + 64
    23  UIKit                               0x003748a2 -[UITabBarController _setSelectedViewController:] + 263
    24  UIKit                               0x00374711 -[UITabBarController _tabBarItemClicked:] + 352
    25  UIKit                               0x002b14fd -[UIApplication sendAction:to:from:forEvent:] + 119
    26  UIKit                               0x004b3ce6 -[UITabBar _sendAction:withEvent:] + 422
    27  UIKit                               0x002b14fd -[UIApplication sendAction:to:from:forEvent:] + 119
    28  UIKit                               0x00341799 -[UIControl sendAction:to:forEvent:] + 67
    29  UIKit                               0x00343c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    30  UIKit                               0x00341750 -[UIControl sendActionsForControlEvents:] + 49
    31  UIKit                               0x002b14fd -[UIApplication sendAction:to:from:forEvent:] + 119
    32  UIKit                               0x00341799 -[UIControl sendAction:to:forEvent:] + 67
    33  UIKit                               0x00343c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    34  UIKit                               0x003427d8 -[UIControl touchesEnded:withEvent:] + 458
    35  UIKit                               0x002d5ded -[UIWindow _sendTouchesForEvent:] + 567
    36  UIKit                               0x002b6c37 -[UIApplication sendEvent:] + 447
    37  UIKit                               0x002bbf2e _UIApplicationHandleEvent + 7576
    38  GraphicsServices                    0x01719992 PurpleEventCallback + 1550
    39  CoreFoundation                      0x00da2944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
    40  CoreFoundation                      0x00d02cf7 __CFRunLoopDoSource1 + 215
    41  CoreFoundation                      0x00cfff83 __CFRunLoopRun + 979
    42  CoreFoundation                      0x00cff840 CFRunLoopRunSpecific + 208
    43  CoreFoundation                      0x00cff761 CFRunLoopRunInMode + 97
    44  GraphicsServices                    0x017181c4 GSEventRunModal + 217
    45  GraphicsServices                    0x01718289 GSEventRun + 115
    46  UIKit                               0x002bfc93 UIApplicationMain + 1160
    47  peek 3 week clear                    0x00002658 main + 102
    48  peek 3 week clear                    0x000025e9 start + 53
)
terminate called after throwing an instance of 'NSException'
Program received signal:  “SIGABRT”.

我做错了什么？谢谢

Answer 1

您可能已经在 Interface Builder 的“Identity”选项卡中将“cure”类分配给了 UIView。 “cure”是一个 View Controller ，因此它没有实现任何 UIView 方法(例如 -superview)，因此在尝试加载 nib 时会抛出异常。

顺便说一句，你的代码中有一大堆漏洞，请阅读一些关于 Objective-C 中的内存管理的内容(也许还有关于 Cocoa 命名约定的内容)。