如何从NSMutableArray中删除NULL值？ IOS [英] how to remove NULL values from NSMutableArray? ios

问题描述

我有一系列的生日，因为数组正在从facebook填充所以有一些朋友，其中生日是私有的所以它包含NULL如何转换该数组像空字符串，只要有空值，数组如下所示

i have array of birthdates as array is getting filled from facebook so there are some friends whos birthdates are private so it contain NULL how to convert that array like empty string wherever there is null value the array is like below

"<null>",
"10/29/1988",
"11/13",
"03/24/1987",
"04/25/1990",
"03/13",
"01/01",
"<null>",
"12/15/1905",
"07/10",
"11/02/1990",
"12/30/1990",
"<null>",
"07/22/1990",
"01/01",
"07/17/1989",
"08/28/1990",
"01/10/1990",
"06/12/1990",

推荐答案

null 值似乎是字符串文字 @< ; null>而不是通常用于在Cocoa中表示 nil 的 NSNull 对象集合。您可以使用 NSArray 的 filteredArrayUsingPredicate 方法过滤掉它们：

The null values appear to be string literals @"<null>" rather than the NSNull objects typically used to represent nils in Cocoa collections. You can filter them out by using NSArray's filteredArrayUsingPredicate method:

NSArray *filtered = [original filteredArrayUsingPredicate:pred];

有几种方法可以制作 pred ，其中一个是

There are several ways of making the pred, one of them is

NSPredicate *pred = [NSPredicate predicateWithBlock:^BOOL(id str, NSDictionary *unused) {
    return ![str isEqualToString:@"<null>"];
}];

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