根据浮点值对对象数组进行排序 [英] sorting an array of object with respect to the float value

问题描述

我在一个项目中工作，在这里我收到一个对象数组，每个对象都有一个字符串类型的描述和一个CGfloat类型的值. 我需要按价值对它们进行排序，然后将它们存储在一个数字中. 我尝试了这种解决方案，但是没有用. 如何对带有自定义对象的NSMutableArray进行排序它吗? 知道怎么做吗?

for (PNPieChartDataItem *item in items) {// didnt work
NSArray *sortedArray;
        sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];


        }

解决方案

您不需要for循环，sortedArrayUsingComparator迭代值以进行比较:

NSArray *sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];
}

使用sortedArray.

im working with a project , where i receive an array of object, each object has a description of type string, and a value of type CGfloat. i need to sort them by value increasingly, and store them in a dicitonary. i tried this solution, but it didn't work. How do I sort an NSMutableArray with custom objects in it? any idea how to do it?

for (PNPieChartDataItem *item in items) {// didnt work
NSArray *sortedArray;
        sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];


        }

解决方案

You don't need a for loop, sortedArrayUsingComparator iterates on values to compare:

NSArray *sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];
}

Use sortedArray.

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