iphone - 返回一个静态常量[]

Question

因此，在我的模型中，我有以下代码...我能够成功返回每个单独的值。我想知道如何返回整个扬声器表[]...也许一些建议。谢谢!

typedef struct {
    NSUInteger speakerID;
    NSString * speakerName;
    NSString * speakerPosition;
    NSString * speakerCompany;
} SpeakerEntry;

static const SpeakerEntry speakerTable [] = 
{
    {0, @"name", @"position", @"company"},
    {1, @"name", @"position", @"company"},
    {-1, nil, nil, nil}
};

这可以正常工作...

-(NSString *) stringSpeakerCompanyForId:(NSUInteger) identifier{
NSString * returnString = nil;
if ([self helpCount] > identifier) {
    returnString = speakerTable[identifier].speakerCompany;
}
return returnString;

}

这根本不起作用..

-(id) getSpeaker{
//if ([speakerTable[0].speakerName isKindOfClass:[NSString class]])
//  NSLog(@"YES");
NSArray * myArray3 = [NSArray arrayWithArray:speakerTable];
return myArray3;

}

Answer 1

arrayWithArray 需要一个 NSArray，而不是一个 C 数组。

第一个有效，因为您像使用 C 数组一样使用它。

或者 - 不使用结构体，而是使用对象:

创建一个名为“Speaker”的类。

在Speaker.h中

@interface Speaker : NSObject {}

@property (nonatomic, assign) NSUinteger id;
@property (nonatomic, copy) NSString name;
@property (nonatomic, copy) NSString position;
@property (nonatomic, copy) NSString company;

- (void)initWithId:(NSUInteger)anId name:(NSString *)aName position:(NSString *)aPosition company:(NSString *)aCompany;

@end

在Speaker.m

#import "Speaker.h"

@implementation Speaker

@synthesize id, name, position, company;

- (void)initWithId:(NSUInteger)anId name:(NSString *)aName position:(NSString *)aPosition company:(NSString *)aCompany {
    if (!([super init])) {
        return nil;
    }
    id = anId;
    NSString name = [[NSString alloc] initWithString:aName];
    NSString position = [[NSString alloc] initWithString:aPosition];
    NSString company = [[NSString alloc] initWithString:aCompany];

    return self;
}

- (void)dealloc {
    [name release];
    [position release];
    [company release];
    [super dealloc];
}

@end

现在，在您的调用代码中，您可以使用以下命令创建不可变的扬声器数组:

Speaker *speaker0 = [[Speaker alloc] initWithId:0 name:@"name0" position:@"position0" company:@"company0"];
Speaker *speaker1 = [[Speaker alloc] initWithId:1 name:@"name1" position:@"position1" company:@"company1"];
Speaker *speakerNull = [[Speaker alloc] initWithId:-1 name:nil position:nil company:nil];

NSArray *speakerArray [[NSArray arrayWithObjects: speaker0, speaker1, speakerNull] retain]

[speaker0 release];
[speaker1 release];
[speakerNull release];

注意:这是直接输入的，因此请随时提及/更正拼写错误或错误