我正在尝试将为我创建的同事称为Web服务，但我收到此错误：
-[__NSArrayM objectForKeyedSubscript:]: unrecognized selector sent to instance 0x7fb30bf13ac0' xcode error
我是xcode的新手，还在学习。一个简单的基本解释会对我有很大帮助
下面我还会附上我的m和h文件代码
PlayerProgViewController.m文件
#import "PlayerProgViewController.h"
//step to make the flickrDictionary into a ivar instead of a local variable of the didReceieveData method
//added a mutable array so we can parse the dictionary and put the objects into the array for use in the tableview
@interface PlayerProgViewController()
{
NSDictionary * flickrDictionary;
NSMutableArray * cFRAIPArray;
}
@end
@implementation PlayerProgViewController
@synthesize playerTableView;
//test for an array for the data to take up
@synthesize myData;
//a method that shows the user what is appearing on the screen
-(void)viewDidLoad
{
[super viewDidLoad];
//to help create the empty array that the data will occupy (TEST)
//TRYING TO FIX ERROR! (COMMENT OUT FOR NOW)
//self.dataArray = [[NSMutableArray alloc]init];
//TEST to call web service!!!!!
NSURL * myURL = [NSURL URLWithString:@"http://1.1.1.20:8080/Andrews/players"];
NSURLRequest * myRequest = [NSURLRequest requestWithURL:myURL];
NSURLConnection * myConnection = [NSURLConnection connectionWithRequest:myRequest delegate:self];
}
//TEST to call web service!!!!!...HERE TO..
//this method displays an error code or sends data if an error occurs or not
//if the response recieved is good, the server begins to send data
//if good goes to didRecieveData method
//if an error occurs then goes to didFailWithError method
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
//with the webservice availble, goes here from _dataarray
NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse *)response;
int errorCode = httpResponse.statusCode;
NSString * fileMIMEType = [[httpResponse MIMEType]lowercaseString];
NSLog(@"response is %d, %@",errorCode, fileMIMEType);
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(@"data is %@",data);
//shows the same result in our web browser that we want to call
//next step to put it in an IOS object so we can pass it around and do whatever we want with it
NSString * myString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"string is %@",myString);
//steps to GET the data (putting it in an object)
//this manipulates the data from the web page to a NSDictionary
//NSError * e = nil;
//NSDictionary * ..not needed since we declared the dicitonary on top
flickrDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(@"dictionary is %@",flickrDictionary);
//dummy code
/*
flickrDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&e];
if(![flickrDictionary isKindOfClass:[NSDictionary class]])
{
//handle error
}
else
{
//NSArray * newArray = flickrDictionary[@"TeamRosterProject"];
//OR
cFRAIPArray = flickrDictionary[@"TeamRosterProject"];
}
*/
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
//to inform the user
NSLog(@"Connection failed! Error - %@ %@",
[error localizedDescription],
[[error userInfo]objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//do something with the data
//receivedData is declared as a method instance elsewhere
NSLog(@"Succeeded!");
//now we parse the dictionary only once it is fully populated from the web fetch
//originally 12 was set as 5
cFRAIPArray = [[NSMutableArray alloc]initWithCapacity:12];
for (NSString * key in flickrDictionary){
NSLog(@"the key is %@",flickrDictionary[key]);
//APP CRASHES HERE!!!!!!===============================
id object = flickrDictionary[key];
if ([object isKindOfClass:[NSDictionary class]]) {
//use firstName to replace _content?
//firstName is the valueForKey?
NSLog(@"object valueForKey is %@",[object valueForKey:@"_content"]);
[cFRAIPArray addObject:[object valueForKey:@"_content"]];
}else{
[cFRAIPArray addObject:flickrDictionary[key]];
}
}
NSLog(@"cfraiparray %@", cFRAIPArray);
[self.playerTableView reloadData];
}
//...HERE
//these methods are called every time the view will do this or that
//views appear many times but are only loaded once
-(void)viewWillAppear:(BOOL)animated{
}
-(void)viewDidAppear:(BOOL)animated{
}
-(void)viewWillDisappear:(BOOL)animated{
}
//required methods in a tableview
//all called once,but didSelectRow..gets called many times
/*
numberOfSectionsInTableView
numberOfRowsInSection
cellForRowAtIndexPath
//set here?
didSelectRowAtIndexPath
*/
#pragma mark - UITableView Data Source
//UITableView Delegate requires the 3 methods below!
//TRYING TO FIX ERROR! (COMMENT OUT FOR NOW)
/*
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;//return the number of sections
}
*/
//TRYING TO FIX ERROR! (COMMENT OUT FOR NOW)
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//??????why as _dataArray and not as dataArray
//PAUSES HERE AND NOTHING IS RETURNED (POINT OF ERROR)
return [_dataArray count];
//return the number of rows in the section
//if you are serving data from an array, return the length of the array
//categorry is the name of the array
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowIndexPath:(NSIndexPath *)indexPath{
static NSString *MyIdentifier = @"Identifier";
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if(cell==nil){
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
}
//OLD WAY TO SET DATA IN THE TABLE
//[cell.textLabel setText:[dict valueForKey:@"TeamID"]];
//sets data for this cell (needed?)
/*
cell.textLabel.text = [_dataArray objectAtIndex:indexPath.row];
cell.detailTextLabel.text = @"More text";
cell.imageView.image = [UIImage imageNamed:@"name of image.png"];
//sets the accessory view
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
*/
return cell;
//keep this
cell.textLabel.text = [cFRAIPArray objectAtIndex:indexPath.row];
//used to set data to the detail text label (save for later)
cell.detailTextLabel.text = [cFRAIPArray objectAtIndex:indexPath.row];
}
@end
PlayerProgViewController.h文件
#import <UIKit/UIKit.h>
//(test)
/*
@protocol PlayerModelProtocol <NSObject>
-(void)itemsDownloaded:(NSArray *)items;
@end
*/
@interface PlayerProgViewController : UIViewController <UITableViewDataSource,UITableViewDelegate>
//(test2) continued
/*
@interface PlayerModelProtocol:NSObject
@property (nonatomic, weak) id<PlayerModelProtocol> delegate;
-(void)downloadItems;
*/
//@property (strong,nonatomic)NSArray * myPlayerData;
@property (weak, nonatomic) IBOutlet UITableView *playerTableView;
@property NSMutableArray * dataArray;
//contains all the data i created (TEST)
@property (strong, nonatomic) NSArray * myData;
//SETTING PROPERTIES (testing with firstName)
//@property (nonatomic, strong)NSString * firstName;
@end
这是应用程序中断的地方
NSLog(@"the key is %@",flickrDictionary[key]);
id object = flickrDictionary[key];
答案 0 :(得分：1)
你得到一个数组。所以迭代一个数组：
for (NSDictionary * player in flickrArray) // The former flickrDictionary, rename it
{
NSLog(@"the player is %@",player);
if ([player isKindOfClass:[NSDictionary class]])
{
NSLog(@"object valueForKey is %@",[player valueForKey:@"_content"])
…
}
}