如何从 NSMutableArray 获取货币总和 [英] How get the total sum of currency from a NSMutableArray

问题描述

我想从 NSMutableArray 计算货币总和.例如:我有一个 arrayA (1,234.56 , 2,345.67) 并且在对数组中的项目求和之后，我希望结果显示:3,580.23 将它放在标签上.有没有办法实现这个?

I want to sum of currency from NSMutableArray. Ex: I have an arrayA (1,234.56 , 2,345.67) and after sum items in array, I want result show: 3,580.23 to put it on the Label. Is there the way to implement this?

谢谢

推荐答案

如果值存储为 NSNumber 对象，则可以使用集合运算符.例如:

If the values are stored as NSNumber objects, you can use the collection operators. For example:

NSArray *array = @[@1234.56, @2345.67];
NSNumber *sum = [array valueForKeyPath:@"@sum.self"];

如果您想使用 NSNumberFormatter 很好地格式化 sum:

If you want to format that sum nicely using NSNumberFormatter:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;
NSString *result = [formatter stringFromNumber:sum];

NSLog(@"result = %@", result);

<小时>

如果您的值确实由字符串表示，@"1,234.56"、@"2,345.67" 等，那么您可能需要手动遍历数组，使用 NSNumberFormatter 将它们转换为数值，然后将它们相加:

---

If your values are really represented by strings, @"1,234.56", @"2,345.67", etc., then you might want to manually iterate through the array, converting them to numeric values using the NSNumberFormatter, adding them up as you go along:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;

NSArray *array = @[@"1,234.56", @"2,345.67"];

double sum = 0.0;

for (NSString *string in array) {
    sum += [[formatter numberFromString:string] doubleValue];
}

NSString *result = [formatter stringFromNumber:@(sum)];

NSLog(@"result = %@", result);

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