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我有两个不同的视图控制器 ViewController.m 和teacherList.m。我正在尝试从teacherList.m 调用-(NSMutableArray *)getTeachersList 方法，让它为我创建一个数组，然后能够在ViewController.m 中使用它。我想通过硬编码而不是排序或使用故事板来做到这一点

视图控制器.m

#import "ViewController.h"
#import "teacherList.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize userView;
- (void)viewDidLoad
{
NSMutableArray *hey = [teacherList getTeachersList];;

NSString *hello = [hey objectAtIndex:0];

[self say:hello];

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)say:(NSString *)greet{
userView.text = greet;
}


- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

教师列表.m 文件

#import "teacherList.h"

@interface teacherList ()

@end

@implementation teacherList

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

-(NSMutableArray *)getTeachersList{
NSURL *website = [NSURL URLWithString:@"http://www2.qcc.mass.edu/facAbsence/default.asp"];



NSURLRequest *request = [NSURLRequest requestWithURL:website];



NSURLResponse* response = nil;

NSError *error = nil;

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

//storing data in a string

NSString *myString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

//putting it into an array to be

//able to working wiht string or array

NSArray *newString = [myString componentsSeparatedByString:@"\n"];


NSMutableArray *teacherArray = [[NSMutableArray alloc]init];
NSMutableString *curLineNum;
NSString *curLine;

int i;

for (i = 0; i <[newString count]; i++) {

    curLine = [newString objectAtIndex:i];

    if ([curLine rangeOfString:@"<strong>"].location != NSNotFound) {

        NSScanner *theScanner = [NSScanner scannerWithString:curLine];

        [theScanner scanUpToString:@"<strong>" intoString:NULL];

        [theScanner setScanLocation: [theScanner scanLocation]+8];

        [theScanner scanUpToString:@"</strong>" intoString:&curLineNum];

        [teacherArray addObject:curLineNum];

    }

}
return teacherArray;

}


@end
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1 回答 1

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不要将该方法getTeachersList放在视图控制器中。创建一个单例对象，它是NSObject. 让我们称之为TeacherListManager。

然后向单身人士索要老师的名单。

调用可能如下所示：

TeacherListManager *theTeacherListManager = [TeacherListManager sharedTeacherListManager];

NSMutableArray *theTeacherList = theTeacherListManager.teachersList;

if (theTeacherList == nil)
  //Handle the case where the teacher list hasn't been loaded yet.

搜索 Objective C 单例设计模式以获取更多信息。

您getTeachersList当前编写的方法是使用同步网络调用获取教师列表，这很糟糕。如果有任何东西减慢了网络连接，那么它可能会挂起 UI 长达 2 分钟，直到连接超时。

您应该重写该方法以异步下载数据。

于 2013-10-22T18:14:35.240 回答