检查NSArray中对象的重复属性值 [英] Check duplicate property values of objects in NSArray

问题描述

我有一个 NSArray 包含 size 属性的对象。

我如何检查 NSArray 是否有两个具有相同值的对象 size ？

我可以这样做：

  int i = 0; 
 for（id item1 in myArray）{
 NSDecimalNumber * size1 = [item1 size]; 
 
 for（id item2 in myArray）{
 NSDecimalNumber * size2 = [item2 size]; 
 
 if（[size1 isEqual：size2]）{
 i ++; 
} 
} 
} 
 
 if（i> [myArray count]）{
 NSLog（@Duplicate Sizes Exist）; 
} 
  

还是有更简单的方法？

解决方案

尝试此代码：

  NSSet * myset = [NSSet setWithArray：[myarray valueForKey：@size]]; 
 int duplicatesCount = [myarray count]  -  [myset count]; 
  

size

I have an NSArray containing objects with a size property.

How can I check if the NSArray has two objects with the same value for size?

Can I do something like:

int i = 0;
for (id item1 in myArray) {
    NSDecimalNumber *size1 = [item1 size];

    for (id item2 in myArray) {
        NSDecimalNumber *size2 = [item2 size];

        if ([size1 isEqual:size2]) {
            i ++;
        }
    }
}

if (i > [myArray count]) {
    NSLog(@"Duplicate Sizes Exist");
}

Or is there an easier way?

解决方案

Try this code:

NSSet *myset = [NSSet setWithArray:[myarray valueForKey:@"size"]];
int duplicatesCount = [myarray count] - [myset count];

size here is the object property.

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