KVC不为人知的干货小技巧

这里给大家推荐一下一些不为人知的超实用的KVC技巧，瞬间提高自己的逼格

获取数组里的,最大、最小、平均、求和

NSArray *array = @[@"1",@"2",@3,@4,@"5"]; 
NSNumber *sum = [array valueForKeyPath:@"@sum.floatValue"]; 
NSNumber *avg = [array valueForKeyPath:@"@avg.floatValue"]; 
NSNumber *max = [array valueForKeyPath:@"@max.floatValue"]; 
NSNumber *min = [array valueForKeyPath:@"@min.floatValue"];  
NSLog(@"sum:%@",sum); 
NSLog(@"avg:%@",avg);
NSLog(@"max:%@",max); 
NSLog(@"min:%@",min);

去除重复的数据

NSArray *array = @[@"a", @"b", @"a", @"c", @"d"]; 
NSArray *newArray = [array valueForKeyPath:@"@distinctUnionOfObjects.self"]; 
NSLog(@"%@", newArray);

可以进行嵌套使用

NSArray *array = @[
 @{@"name":@"ken"}, 
 @{@"name":@"kenrry"}, 
 @{@"name":@"ken"}, 
 @{@"name":@"kenrry1008"}];
//根据name字段，来进行重复删除。
NSArray *newArray = [array valueForKeyPath:@"@distinctUnionOfObjects.name"];
NSLog(@"%@", newArray);