UITableview显示NSMutableArray中的重复对象

Question

我有一个问题，一直困扰着我一段时间，我写了一个新版本的程序，并得到了完全相同的错误。

当出现以下运行时，我应该得到像一个很好的分段表视图， 1964年 萨姆 -Ham 1965年 -Nim Chimpsky 1980年 - 乔治 -Bubbles

相反，我获得1964年 萨姆 -Ham 萨姆 1980年 萨姆

有没有人有任何提示，我做错了什么？

我的源代码如下：

#import <UIKit/UIKit.h> 


#pragma mark Monkey Object definition 
@interface Monkey : NSObject { 
    NSString *monkeyName; 
    NSString *monkeyBirthYear; 
} 

@property (copy) NSString *monkeyName; 
@property (copy) NSString *monkeyBirthYear; 

-(id)initWithMonkeyName:(NSString*)MN monkeyBirthYear:(NSString *)MBY; 


@end 

@implementation Monkey 

@synthesize monkeyName; 
@synthesize monkeyBirthYear; 

-(id)initWithMonkeyName:(NSString *)MN monkeyBirthYear:(NSString *)MBY; 
{ 
    if ((self =[super init])) { 
     monkeyName = [MN copy]; 
     monkeyBirthYear = [MBY copy]; 

    } 
    return self; 
} 


@end 

@interface ViewController : UITableViewController 
{ 
    NSMutableArray *barrel; 
    NSMutableArray *monkeyBirthdayIndex; 

} 
@end 

@implementation ViewController 





#pragma mark UITableView 
- (NSString *)tableView:(UITableView *)aTableView titleForHeaderInSection:(NSInteger)section 
{ 
    return [monkeyBirthdayIndex objectAtIndex:section]; 
} 


-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return [monkeyBirthdayIndex count]; 
} 

- (UITableViewCell *)tableView:(UITableView *)theTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 


    UITableViewCellStyle style = UITableViewCellStyleDefault; 
    UITableViewCell *cell = [theTableView dequeueReusableCellWithIdentifier:@"Cell"]; 
    if(!cell) 
     cell = [[UITableViewCell alloc] initWithStyle:style reuseIdentifier:@"Cell"]; 

    Monkey *m = [barrel objectAtIndex:[indexPath row]]; 

    cell.textLabel.text = [m monkeyName]; 

    return cell; 
} 


- (NSInteger)tableView:(UITableView *)aTableView numberOfRowsInSection:(NSInteger)section 
{ 
    NSString *match = [monkeyBirthdayIndex objectAtIndex:section]; 

    NSArray *currentMonkey = [barrel filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF.monkeyBirthYear LIKE[cd] %@", match]]; 
    return [currentMonkey count]; 

} 



-(void)loadView 
{ 
    [super loadView]; 


    Monkey *monkey1 = [[Monkey alloc] initWithMonkeyName:@"Sam" monkeyBirthYear:@"1964"]; 
    Monkey *monkey2 = [[Monkey alloc] initWithMonkeyName:@"Ham" monkeyBirthYear:@"1964"]; 
    Monkey *monkey3 = [[Monkey alloc] initWithMonkeyName:@"Nim Chimpsky" monkeyBirthYear:@"1965"]; 
    Monkey *monkey4 = [[Monkey alloc] initWithMonkeyName:@"Bubbles" monkeyBirthYear:@"1985"]; 
    Monkey *monkey5 = [[Monkey alloc] initWithMonkeyName:@"George" monkeyBirthYear:@"1980"]; 

    barrel = [NSMutableArray arrayWithObjects:monkey1, monkey2, monkey3, monkey4,monkey5, nil]; 

    monkeyBirthdayIndex = [[NSMutableArray alloc] init]; 

    for (int i=0; i<[barrel count]; i++) { 
     //Get the date of each monkeys birthday 
     Monkey *m = [barrel objectAtIndex:i]; 

     if (![monkeyBirthdayIndex containsObject:[m monkeyBirthYear]]) 
     { 
      [monkeyBirthdayIndex addObject:[m monkeyBirthYear]]; 
     } 

    } 



} 

@end 

@interface AppDelegate :NSObject <UIApplicationDelegate> 
{ 
    UIWindow *window; 
} 
@end 

@implementation AppDelegate 
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    ViewController *vc = [[ViewController alloc] init]; 
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc]; 
    window.rootViewController = nav; 
    [window makeKeyAndVisible]; 
    return YES; 
} 




int main(int argc, char *argv[]) 
{ 
    @autoreleasepool { 
     int returnValue = UIApplicationMain(argc, argv, nil, @"AppDelegate"); 
     return returnValue; 
    } 
} 

@end 

Answer 1

在tableView:cellForRowAtIndexPath:返回在桶的第n个猴子的名字：

Monkey *m = [barrel objectAtIndex:[indexPath row]]; 

你真正想要的是一个子数组的第n个猴子过滤如在tableView: numberOfRowsInSection:中那样。

Answer 2

我更正了tableView：cellForRowAtIndexPath。

- (UITableViewCell *)tableView:(UITableView *)theTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {  
    NSInteger section = [indexPath section];  
    UITableViewCellStyle style = UITableViewCellStyleDefault; 

    UITableViewCell *cell = [theTableView dequeueReusableCellWithIdentifier:@"Cell"]; 
    if(!cell) 
     cell = [[UITableViewCell alloc] initWithStyle:style reuseIdentifier:@"Cell"]; 

    NSString *match = [monkeyBirthdayIndex objectAtIndex:section]; 

    NSArray *currentMonkey = [barrel filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF.monkeyBirthYear LIKE[cd] %@", match]]; 

    Monkey *m = [currentMonkey objectAtIndex:[indexPath row]]; 

    cell.textLabel.text = m.monkeyName; 

    return cell; 
}