以编程方式创建的 UILabel - 再次找到它？
在 viewDidLoad 中，我以编程方式创建了 26 个 UILabel（字母表中的每个字母一个），并将字母表中的字母放入每个标签中（第一个为 A，第二个为 B...）。
后来我想找到一个特定的标签（比如包含字母“F”的标签）。我知道我想要查找的字母及其在字母表中的索引（因此对于 F，我知道它的索引是 5，因为 F 是字母表中的第 6 个字母）
我怎样才能找到这个标签？
当然，我可以制作 26 个 IBOutlet 并引用它们，但这看起来很麻烦。
这就是我创建标签的方式：
// set letters
letters = [[NSArray alloc] initWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];
int positionX = 0;
int positionY = 0;
for(int i = 0; i < [letters count]; i++) {
/* a lot of positioning stuff is here (positionX and positionY is set. I have removed this to make the code look cleaner */
UILabel *letterLabel = [[UILabel alloc] initWithFrame:CGRectMake(positionX, positionY, 50, 50)];
letterLabel.text = [letters objectAtIndex:i];
letterLabel.backgroundColor = [UIColor clearColor];
letterLabel.font = [UIFont fontWithName:@"Helvetica" size:45];
letterLabel.textAlignment = UITextAlignmentCenter;
[self.view addSubview:letterLabel];
[letterLabel release];
}
In viewDidLoad I have created 26 UILabels programmatically (one for each letter in the alphabet) and I have put the letters from the alphabet into each label (A in the first, B in the second...).
Later I would like to find one specific label (say, the label containing the letter "F"). I know both the letter I want to find and its index in the alphabet (so for F, I know that its index is 5 because F is the 6th letter in the alphabet)
How can I find this label?
Of course, I can make 26 IBOutlets and refer to them but this seems such a hassle.
This is how I create the labels:
// set letters
letters = [[NSArray alloc] initWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];
int positionX = 0;
int positionY = 0;
for(int i = 0; i < [letters count]; i++) {
/* a lot of positioning stuff is here (positionX and positionY is set. I have removed this to make the code look cleaner */
UILabel *letterLabel = [[UILabel alloc] initWithFrame:CGRectMake(positionX, positionY, 50, 50)];
letterLabel.text = [letters objectAtIndex:i];
letterLabel.backgroundColor = [UIColor clearColor];
letterLabel.font = [UIFont fontWithName:@"Helvetica" size:45];
letterLabel.textAlignment = UITextAlignmentCenter;
[self.view addSubview:letterLabel];
[letterLabel release];
}
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有两种基本方法可以做到这一点：
1. 创建数组
只需在视图控制器中创建一个 NSMutableArray 作为 ivar，然后在创建标签时添加标签。要查找 F，请使用
[myArray objectAtIndex:5]。2. 使用标签
创建标签时，设置其标签 (
[letterLabel setTag:i])。然后，当您想要检索它时，请使用[[self view] viewWithTag:5]。There are two basic ways to do this:
1. Create An Array
Simply make an
NSMutableArrayas an ivar in your view controller, then add the labels as they’re created. To find F, use[myArray objectAtIndex:5].2. Use Tags
When you create the label, set its tag (
[letterLabel setTag:i]). Then, when you want to retrieve it, use[[self view] viewWithTag:5].我能想到的两种方法：
将所有标签添加到
NSArray;为所有标签设置
tag属性，并为每个标签设置特定的已知值，并使用[self.view viewWithTag:TheTagForTheLabel];访问它们
Two approaches I can think of:
Add all your labels to an
NSArray;Set the
tagproperty for all the labels with a specific know value for each label and access them with[self.view viewWithTag:TheTagForTheLabel];我可能会创建一个 NSMutableDictionary，其中包含一个 NSString，其中包含字母作为键，关联的 UILabel 作为对象。
I probably would've created an NSMutableDictionary with an NSString containing the letter as the key and the associated UILabel as the object.