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從.plist（-[NSCFString objectAtIndex：]）填充時TableView崩潰

[英]TableView Crashes when populates from .plist (-[NSCFString objectAtIndex:])

 原文  2011-02-26 00:30:42  4   2    iphone/ objective-c/ uitableview/ sdk

問題描述

大家好，我的應用在加載時崩潰，在調試時會拋出此錯誤： 

2011-02-26 00:24:33.254 LCPapers[5182:207] Set up the cell...
2011-02-26 00:24:33.255 LCPapers[5182:207] 0
2011-02-26 00:24:33.257 LCPapers[5182:207] -[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x4b175f0
2011-02-26 00:24:33.261 LCPapers[5182:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x4b175f0'

如果有人告訴我要解決的問題，那真是太好了，因為我還很新，而且為此而沮喪的時間真是太恐怖了！

RootViewController.h 

#import <UIKit/UIKit.h>
@class OverlayViewController;
@interface RootViewController : UITableViewController {

    NSArray *tableDataSource;
    NSString *CurrentTitle;
    NSInteger CurrentLevel;
    IBOutlet UITableView *tableView;
    NSDictionary *data;
    BOOL letUserSelectRow;

    OverlayViewController *ovController;

}
@property (nonatomic, retain) NSArray *tableDataSource;
@property (nonatomic, retain) NSString *CurrentTitle;
@property (nonatomic, readwrite) NSInteger CurrentLevel;
@property (nonatomic, retain) NSDictionary *data;

@end

和我的RootViewController.m 

#import "RootViewController.h"
#import "DetailViewController.h"
#import "LCPapersAppDelegate.h"

@implementation RootViewController
@synthesize tableDataSource, CurrentTitle, CurrentLevel;
@synthesize data;
#pragma mark -
#pragma mark View lifecycle


- (void)viewDidLoad {
    [super viewDidLoad];
    // Override point for customization after application launch.
    NSString *Path = [[NSBundle mainBundle] bundlePath];
    NSString *DataPath = [Path stringByAppendingPathComponent:@"data.plist"];

    NSDictionary *tempDict = [[NSDictionary alloc] initWithContentsOfFile:DataPath];
    self.data = tempDict;
    [tempDict release];

    if(CurrentLevel == 0) {
        NSLog(@"Initialize our table data source");
        //Initialize our table data source
        self.navigationItem.title = @"Leaving Cert. Papers";

        NSArray *tempArray = [[NSArray alloc] init];
        self.tableDataSource = tempArray;
        [tempArray release];


        self.tableDataSource = [data objectForKey:@"Rows"];

    }
    else 
        NSLog(@"self.navigationItem.title = CurrentTitle;");

    self.navigationItem.title = CurrentTitle;   

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}

#pragma mark Table view methods

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


// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSLog(@"Customize the number of rows in the table view.");
    return [self.tableDataSource count];
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"Customize the appearance of table view cells.");
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }
    // Set up the cell...
    NSLog(@"Set up the cell...");
    NSLog(@"%d", indexPath.row);
    NSDictionary *dictionary = [self.tableDataSource objectAtIndex:indexPath.row];
    NSArray *array = [dictionary objectForKey:@"Title"];
    cell.text = [array objectAtIndex:indexPath.row];

    return cell;
}



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    //Get the selected Subject

    NSString *selectedSubject = nil;

        NSDictionary *dictionary = [self.tableDataSource objectAtIndex:indexPath.row];
        NSArray *array = [dictionary objectForKey:@"Title"];
        selectedSubject = [array objectAtIndex:indexPath.row];


    //Initialize the detail view controller and display it.
    DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
    dvController.selectedSubject = selectedSubject;
    [self.navigationController pushViewController:dvController animated:YES];

    [dvController release];
    dvController = nil;
}

- (NSIndexPath *)tableView :(UITableView *)theTableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    if(letUserSelectRow)
        return indexPath;
    else
        return nil;
}

- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {

    //return UITableViewCellAccessoryDetailDisclosureButton;
    return UITableViewCellAccessoryDisclosureIndicator;
}

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath {

    [self tableView:tableView didSelectRowAtIndexPath:indexPath];
}




- (void)dealloc {
    [data release];
    [ovController release];

    [super dealloc];
}


@end

應盧卡·貝納迪（Luca Bernardi）的要求，以下為清單： 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Rows</key>
    <array>
        <dict>
            <key>Title</key>
            <string>English</string>
            <key>Children</key>
            <array>
                <dict>
                    <key>Title</key>
                    <string>Paper 1</string>
                    <key>Children</key>
                    <array>
                        <dict>
                            <key>Title</key>
                            <string>2010</string>
                        </dict>
                        <dict>
                            <key>Title</key>
                            <string>2009</string>
                        </dict>
                    </array>
                </dict>
                <dict>
                    <key>Title</key>
                    <string>Paper 2</string>
                    <key>Children</key>
                    <array>
                        <dict>
                            <key>Title</key>
                            <string>2010</string>
                        </dict>
                        <dict>
                            <key>Title</key>
                            <string>2009</string>
                        </dict>
                    </array>
                </dict>
            </array>
        </dict>
        <dict>
            <key>Title</key>
            <string>Maths</string>
            <key>Children</key>
            <array>
                <dict>
                    <key>Title</key>
                    <string>Higher</string>
                    <key>Children</key>
                    <array>
                        <dict>
                            <key>Title</key>
                            <string>Paper 1</string>
                            <key>Children</key>
                            <array>
                                <dict>
                                    <key>Title</key>
                                    <string>2010</string>
                                    <key>Url</key>
                                    <string>http://x.ie/LC003ALP100EV.pdf</string>
                                </dict>
                                <dict>
                                    <key>Title</key>
                                    <string>2009</string>
                                    <key>Url</key>
                                    <string>http://x.ie/LC003ALP100EV.pdf</string>
                                </dict>
                            </array>
                        </dict>
                        <dict>
                            <key>Title</key>
                            <string>Paper 2</string>
                            <key>Children</key>
                            <array>
                                <dict>
                                    <key>Title</key>
                                    <string>2010</string>
                                    <key>Url</key>
                                    <string>http://examinations.ie/archive/exampapers/2010/LC003ALP200EV.pdf</string>
                                </dict>
                                <dict>
                                    <key>Title</key>
                                    <string>2009</string>
                                    <key>Url</key>
                                    <string>http://examinations.ie/archive/exampapers/2009/LC003ALP200EV.pdf</string>
                                </dict>
                            </array>
                        </dict>
                    </array>
                </dict>
                <dict>
                    <key>Title</key>
                    <string>Ordinary</string>
                    <key>Children</key>
                    <array>
                        <dict>
                            <key>Title</key>
                            <string>Paper 1</string>
                            <key>Children</key>
                            <array>
                                <dict>
                                    <key>Title</key>
                                    <string>2010</string>
                                    <key>Url</key>
                                    <string>http://www.examinations.ie/archive/exampapers/2010/LC003GLP100EV.pdf</string>
                                </dict>
                                <dict>
                                    <key>Title</key>
                                    <string>2009</string>
                                    <key>Url</key>
                                    <string>http://www.examinations.ie/archive/exampapers/2009/LC003GLP100EV.pdf</string>
                                </dict>
                            </array>
                        </dict>
                        <dict>
                            <key>Title</key>
                            <string>Paper 2</string>
                            <key>Children</key>
                            <array>
                                <dict>
                                    <key>Title</key>
                                    <string>2010</string>
                                    <key>Url</key>
                                    <string>http://www.examinations.ie/archive/exampapers/2010/LC003GLP200EV.pdf</string>
                                </dict>
                                <dict>
                                    <key>Title</key>
                                    <string>2009</string>
                                    <key>Url</key>
                                    <string>http://www.examinations.ie/archive/exampapers/2009/LC003GLP200EV.pdf</string>
                                </dict>
                            </array>
                        </dict>
                    </array>
                </dict>
            </array>
        </dict>
    </array>
</dict>
</plist>
enter code here

2 個解決方案

解決方案1
 0 已采納  2011-02-26 00:57:31

在這一行，您實際上是在獲取一個字符串（“ English ”）： 

NSArray *array = [dictionary objectForKey:@"Title"];

接下來，您要做的是： 

selectedSubject = [array objectAtIndex:indexPath.row];

這崩潰，因為對象是字符串，而不是數組。

這應該工作： 

NSDictionary *dictionary = [self.tableDataSource objectAtIndex:indexPath.row];
cell.text = [dictionary objectForKey:@"Title"];

解決方案2
 0  2011-02-26 04:53:34

警告您的本地聲明...似乎您已通過xib取得了表格...。並且給定的名稱必須是tableview ...，而tableview委托和數據源方法中的名稱也為tableview。

將表視圖的名稱更改為其他名稱，例如presentTableView或您想要的名稱。 現在，它不會向您顯示這種類型的警告..因為名稱相同.....

或可能是因為您在.h和.m文件中聲明了相同名稱的對象 

e.g. if i write 
NSString *myStr;

在我的.h文件中

如果我也寫在我的.m文件中 

 NSString *myStr;
 myStr== [NSString stringWithFormat:@"bg%d_iPad.png"];

編譯器將顯示警告，變量的局部聲明會隱藏實例變量。 希望這個能對您有所幫助

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