-(void)testSome
{
NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max = [[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min = [[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);
}
输出：
2018-01-18 10:51:59.806407 ettNextGen[990:187961] 21.2999994.26000010.0000002.000000
