NSPredicate过滤通过的数组对象

Question

。这是我的自定义NSObject类：

@interface personObject : NSObject 

@property (nonatomic, copy) NSString *personName; 
@property (nonatomic, copy) UIImage *personPhoto; 

@property BOOL invited; 

- (id) initWithName: (NSString *) personName Photo: (UIImage *) photo Invited: (BOOL *) invited; 

@end 

@implementation personObject 
@synthesize personName = _personName; 
@synthesize personPhoto = _personPhoto; 
@synthesize invited = _invited; 

- (id) initWithName:(NSString *)personName Photo:(UIImage *)photo Invited:(BOOL *)invited{ 
    self = [super init]; 
    if (self) { 
     self.personName = personName; 
     self.personPhoto = photo; 
     self.invited = invited; 
    } 
    return self; 
} 

@end 

我初始化三人在viewDidLoad中的对象。 现在我试图

[NSPredicate predicateWithFormat:@"personName beginswith[c], searchText]; 

但我得到一个错误 -

-[personObject copyWithZone:]: unrecognized selector sent to instance 0x109684330' 

所以，我想这：

- (void) filterContententForSearchText: (NSString *) searchText scope:(NSString *) scope{ 
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K beginsWith[c] %@",_currentPerson.personName, searchText ]; 
    self.searchArray = [self.peopleArray filteredArrayUsingPredicate:predicate]; 
} 

所以我试图设置

_currentPerson = [self.peopleArray objectAtIndex.row]; 

在

tableViewcellForRowAt IndexPath方法，并用它来代替。但我得到一个不同的错误 - 原因：

'[<personObject 0x109524750> valueForUndefinedKey:]: this class is not key value coding-compliant for the key Paul Smith.' 

这两个错误发生在我开始键入搜索栏时。

继承人的排法......如何设置单元格文本搜索阵列

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    personObject *currentPerson = [self.peopleArray objectAtIndex:indexPath.row]; 

    self.personCell = (personCell *) [self.tableView dequeueReusableCellWithIdentifier:@"personCell"]; 

    if (tableView == self.searchDisplayController.searchResultsTableView) { 
     self.personCell.nameLabel.text = [self.searchArray objectAtIndex:indexPath.row]; 
    } 
    else{ 
     self.personCell.nameLabel.text = currentPerson.personName; 
    } 
    return _personCell; 
} 

Answer 1

您需要检查personName关键不_currentPerson.personName作为key.When你给_currentPerson.personName中currentPerson.personName它采取它的关键，并认为它是应该是NSCoding compliant.But你不需要它整个键你可以通过只@"personName"为字符串，它会通过keyValueCoding .Replace工作上面的函数下面

- (void) filterContententForSearchText: (NSString *) searchText scope:(NSString *) scope{ 
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K beginsWith[c] %@",@"personName", searchText ]; 
    self.searchArray = [self.peopleArray filteredArrayUsingPredicate:predicate]; 
    NSLog(@"%@",seachArray); 
}