我有一个的NSArray
所有具有类型的@property 名称
自定义对象的的NSString
。我怎样才能通过阵列快速枚举,并创建一个新数组,它仅包含有一个特定的词在他们的名称
属性?
例如:
CustomObject * firstObject = [[CustomObject页头]初始化];
firstObject.name = @狗;
CustomObject * secondObject = [[CustomObject页头]初始化];
secondObject.name = @猫;
CustomObject * thirdObject = [[CustomObject页头]初始化];
thirdObject.name = @狗是乐趣;
NSMutableArray里* testArray = [NSMutableArray的arrayWithObjects:firstObject,
secondObject,
thirdObject,
零];
//我要创建一个新的数组,其中包含有单词的所有对象
以他们的名义财产//狗。
我知道我可以使用一个for循环,像这样:
的NSMutableArray * newArray = [NSMutableArray的阵列]
为(在testArray CustomObject * OBJ)
{
如果([obj.name rangeOfString:@狗。位置== NSNotFound){
//未找到字符串
}
其他 {
[newArray ADDOBJECT:OBJ]。
}
}
但是,有没有更有效的方法?谢谢!
解决方案 的NSString * searchString = @狗;
NS predicate * predicate = NS predicate predicateWithFormat:@SELF.name包含%@,searchString]。
NSArray的* filteredArray = [testArray filteredArrayUsing predicate:predicate]。
I have an NSArray
of custom objects that all have a @property name
of type NSString
. How can I quickly enumerate through the array and create a new array that contains only the objects that have a specific word in their name
property?
For instance:
CustomObject *firstObject = [[CustomObject alloc] init];
firstObject.name = @"dog";
CustomObject *secondObject = [[CustomObject alloc] init];
secondObject.name = @"cat";
CustomObject *thirdObject = [[CustomObject alloc] init];
thirdObject.name = @"dogs are fun";
NSMutableArray *testArray = [NSMutableArray arrayWithObjects:firstObject,
secondObject,
thirdObject,
nil];
// I want to create a new array that contains all objects that have the word
// "dog" in their name property.
I know I could use a for loop like so:
NSMutableArray *newArray = [NSMutableArray array];
for (CustomObject *obj in testArray)
{
if ([obj.name rangeOfString:@"dog"].location == NSNotFound) {
//string wasn't found
}
else {
[newArray addObject:obj];
}
}
But is there a more efficient way? Thanks!
解决方案NSString *searchString = @"dog";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name contains %@", searchString];
NSArray *filteredArray = [testArray filteredArrayUsingPredicate:predicate];