valueForKeyPath计算求和、平均值、最大、最小
为什么80%的码农都做不了架构师?>>>
NSArray *testArray = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", nil];
NSNumber *sum = [testArray valueForKeyPath:@"@sum.floatValue"];
NSNumber *avg = [testArray valueForKeyPath:@"@avg.floatValue"];
NSNumber *avg = [testArray valueForKeyPath:@"@max.floatValue"];
NSNumber *avg = [testArray valueForKeyPath:@"@min.floatValue"];
转载于//my.oschina.net/nbren/blog/136485
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