来自NSArray的NSString [英] NSString from NSArray
本文介绍了来自NSArray的NSString的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试从Array.But创建一个String,有条件生成它,如下所述。
I am trying to create a String from Array.But, there is condition to how it should be generated, as explained below.
NSArray *array=[NSArray arrayWithObjects:@"Hello",@"World",nil];
[array componentsJoinedByString:@","];
这将输出:Hello,World。
This will output: Hello,World.
但是,如果第一个项目是空的,那么是否有办法接收唯一的第二个。
But, if first Item is Empty,then is there way to receive the only second one.
- 你好,@=>您好
- @,World => World
- Hello,World => Hello,World
推荐答案
另一种方法是获取数组的可变副本并删除无效对象。这样的事情可能是:
Another way to do this is to grab a mutable copy of the array and just remove non valid objects. Something like this perhaps:
NSMutableArray *array = [[NSArray arrayWithObjects:@"",@"World",nil] mutableCopy];
[array removeObject:@""]; // Remove empty strings
[array removeObject:[NSNull null]]; // Or nulls maybe
NSLog(@"%@", [array componentsJoinedByString:@","]);
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