iOS-计算数组数值总和，平均值，最大值，最小值

    NSArray *tempArray = [NSArray arrayWithObjects:@"2", @"3", @"4",@"5", @"10", nil];
    
    NSNumber *sum = [tempArray valueForKeyPath:@"@sum.floatValue"];
    
    NSNumber *avg = [tempArray valueForKeyPath:@"@avg.floatValue"];
    
    NSNumber *max = [tempArray valueForKeyPath:@"@max.floatValue"];
    
    NSNumber *min = [tempArray valueForKeyPath:@"@min.floatValue"];
    
    
    NSLog(@"sum %@  avg %@ max %@ min %@", sum, avg, max, min);

运行结果：

屏幕快照 2017-08-14 下午4.27.23.png