如何检查 NSMutableArray 是否包含包含特定文本的对象？

发布于 2024-12-13 13:00:17 字数 76 浏览 2 评论 0原文

如何检查 NSMutableArray 是否包含包含特定文本的对象？然后，如果找到一段文本，它将用另一段文本替换它。

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我做我的改变 2024-12-20 13:00:17

像这样的东西应该可以工作：

@interface NSMutableArray (JRAdditions) 

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString;

@end

@implementation NSMutableArray (JRAdditions)

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString {

   for(unsigned i = 0; i < [self count]; ++i) {
      id obj = [self objectAtIndex:i];

      if(![obj isKindOfClass:[NSString class]]) continue;

      NSString *replaced = [str stringByReplacingOccurrencesOfString:str withString:newString];
      [self replaceObjectAtIndex:i withObject:replaced];

   }
}

@end

然后你可以这样使用它：

NSMutableArray *array = ...;

[array replaceStringObjectsContainingString:@"blah" withString:@"foo"];

Something like this should work:

@interface NSMutableArray (JRAdditions) 

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString;

@end

@implementation NSMutableArray (JRAdditions)

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString {

   for(unsigned i = 0; i < [self count]; ++i) {
      id obj = [self objectAtIndex:i];

      if(![obj isKindOfClass:[NSString class]]) continue;

      NSString *replaced = [str stringByReplacingOccurrencesOfString:str withString:newString];
      [self replaceObjectAtIndex:i withObject:replaced];

   }
}

@end

You'd then use it as such:

NSMutableArray *array = ...;

[array replaceStringObjectsContainingString:@"blah" withString:@"foo"];

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著墨染雨君画夕 2024-12-20 13:00:17

您可以在 for 循环内对 NSMutableArray 中的所有对象执行检查，使用
[object rangeOfString:@"text"] 用于检查范围。

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执笏见 2024-12-20 13:00:17

您可以迭代数组，检查每个对象，然后在必要时进行替换。

或者您可以使用更奇特的方法：

- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)anObject

我还没有尝试过，但您可以在对象中创建一个方法，该方法接受字典或数组，其中第一个元素是要比较的文本，第二个元素是要替换的文本：

- (void) replaceTextWithParameters:(NSArray*)parameters {
    if([self.yourText isEqualToString:[parameters objectAtIndex:0]) {
        self.yourText = [parameters objectAtIndex:1];
    }
}

那么您只会有调用：

NSArray *parameterArray = [NSArray arrayWithObjects:@"Text to search", @"replacementText", nil];
[yourArray makeObjectsPerformSelector:@selector(replaceTextWithParameters:) withObject:parameterArray];

在运行时它比循环数组的每个元素要快得多（特别是如果你有很多元素）

You can either iterate on your array, do the checking on each object and then replace if necessary.

Or you could use something fancier with :

- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)anObject

I havent tried it but you could create a method in your object that takes a dictionary, or an array with first element being the text to compare and second element the text to replace :

- (void) replaceTextWithParameters:(NSArray*)parameters {
    if([self.yourText isEqualToString:[parameters objectAtIndex:0]) {
        self.yourText = [parameters objectAtIndex:1];
    }
}

Then you would only have to call :

NSArray *parameterArray = [NSArray arrayWithObjects:@"Text to search", @"replacementText", nil];
[yourArray makeObjectsPerformSelector:@selector(replaceTextWithParameters:) withObject:parameterArray];

It would be a lot faster at run time than looping on each element of your array (especially if you have many elements)

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