iOS - 将UILabel组存储到NSMutableArray中 [英] iOS - Storing groups of UILabels into a NSMutableArray

问题描述

我正在为每个循环动态创建 UILabel 。每个运行的循环都会创建1-4个UILabel。

I'm creating UILabels dynamically in a for each loop. Every loop that is run creates 1-4 UILabels.

我想要的是将这些UILabel放入我的NSMutableArray中，以后能够轻松检索数据。

What I want is that I put these UILabels into my NSMutableArray and being able later to easy retrieve the data.

我最初的想法是将这些UILabel放入 NSDictionary 并使用 [dictGroupLabels setValue：uiLabel1 forKey：@uiLabel1] 然后 [dictGroupLabels setValue：uiLabel2 forKey：@uiLabel2] 依此类推。然后将这个字典放入我的NSMutableArray中，用于每个循环。稍后我可以访问像 UILabel * label = [[myArray objectAtIndex：0] valueForKey：@uiLabel1] 但这样的值，但不幸的是UILabels不符合NSCopying协议。

My original thought was to put these UILabels into a NSDictionary and use [dictGroupLabels setValue:uiLabel1 forKey:@"uiLabel1"] and then [dictGroupLabels setValue:uiLabel2 forKey:@"uiLabel2"] and so on. And then put this dictionary into my NSMutableArray for each loop. Later on I could access the values like UILabel *label = [[myArray objectAtIndex:0] valueForKey:@"uiLabel1"] BUT that unfortunately doesn't work since UILabels don't conform to the NSCopying protocol.

所以考虑到这一点你会如何解决这个问题？

So with this in mind how would you solve this?

推荐答案

这个问题提供了有关您要完成的内容的更多信息。既然你知道一个事实，你想要在每种情况下创建的标签集，我强烈建议使用 mutable dictionaries 而不是数组。

this question provided more information on what you are trying to accomplish. Since you know for a fact, the possible set of labels you are trying to create in each case, I would highly recommend using mutable dictionaries instead of arrays.

为了说明，给出了遵循假设的类定义：

To illustrate, given the following hypothetical class definition:

@interface MyClass: NSObject { 
    NSMutableDictionary * _labelDict; 
} 

@property (nonatomic, retain) NSMutableDictionary * labelDict; 

- ( void )methodA; 
- ( void )methodB; 
- (NSMutableDictionary *) labelsForRunLoop: (NSUInteger) loopIdx;
@end

您将拥有以下假设的类实现：

You would have the following, hypothetical, class implementation:

@implementation MyClass 

@synthesize labelDict = _labelDict; 

- ( id ) init { 
    if( ( self = [ super init ] ) ) { 
        [self setLabelDict: [NSMutableDictionary dictionaryWithCapacity: 8]]; 
    } 
} 

- ( void ) dealloc  { 
    [ self.labelDict release ]; 
    [ super dealloc ]; 
} 

- ( void ) methodA {
    for(NSUInteger i = 0; i < some index; i++) {
        [self.labelDict setObject: [self labelsForRunLoop: i] forKey: [NSString stringWithFormat: @"%d", i]];
    }
} 

- ( void ) methodB { 
    // Locate the label you need to work with. Example based on this crude pseudo code
    NSMutableDictionary * subDict = (NSMutableDictionary *) [self.labelDict objectForKey: @"0"];
    UILabel * theLabel = (UILabel * ) [subDict objectForKey: @"UILabel.Z"]; 
    theLabel.text = @"Label 1"; 
} 

- (NSMutableDictionary *) labelsForRunLoop: (NSUInteger) loopIdx {
    NSMutableDictionary * dictionary = [NSMutableDictionary dictionaryWithCapacity: 4] ;
    [dictionary setObject: create-w-label forKey: @"UILabel.W"];
    [dictionary setObject: create-x-label forKey: @"UILabel.X"];
    [dictionary setObject: create-y-label forKey: @"UILabel.Y"];
    [dictionary setObject: create-z-label forKey: @"UILabel.Z"];

    return [dictionary retain];
}

@end

这基本上是伪代码将无法成功编译。然而，它将是一个很好的起点。您可能希望将每个标签字典存储在一些有意义的键下，而不是仅使用循环索引。希望这会有所帮助。

This is basically pseudo code and will not successfully compile. However it will serve as a good starting point. You probably want to store each label dictionary under some key that makes sense, instead of just using the loop's index. Hope this helps.

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