iOS:FilterUsingPredicate自定义对象

Question

我有一个自定义类扩展NSObject.我正在维护NSMutableArray这个类对象.这是情况,

customObject-class {
   NSString *name;
   int ID;
   .....and many other properties;
}

customObjectsArray [
   customObject1,
   customObject2,
   ...etc
]

现在我尝试使用filterUsingPredicate删除具有nil名称的对象,如下所示,但它返回的对象很少或没有,而我知道有数百个对象的名称不是nil或为空.有人可以告诉我这里可能有什么问题.

[customObjectsArray filterUsingPredicate:[NSPredicate predicateWithFormat:@"name != nil"]];

Answer 1

你为什么不这样做:

NSMutableArray *array=...;
[array filterUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    CustomObject *customObject=(CustomObject *) evaluatedObject;
    return (customObject.name!=nil);
}]];