使用Objective-C的Realm和tableView iOS应用程序：线程1 EXC\u BAD\u访问（代码=，地址=0x30）

我想将我的领域数据库加载到我的tableView中，我的代码如下：

#import "ViewController.h"
#import "customCell.h"
#import "Person.h"

@interface ViewController ()
@property RLMRealm *realm;
@property RLMResults *person;
@end

@implementation ViewController
@synthesize realm, person;
- (void)viewDidLoad {
    [super viewDidLoad];
    Person *one;
    one.firstName = @"Allen";
    one.lastName = @"X";
    realm = [RLMRealm defaultRealm];
    [realm beginWriteTransaction];
    [realm addObject:one];
    [realm commitWriteTransaction];
    self.person = [Person allObjects];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:   (NSInteger)section{
    return [person count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
    NSString *cellIdentifier = @"cellIdentifier";
    customCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    cell.firstName.text = [self.person[indexPath.row] firstName];
    cell.lastName.text = [self.person[indexPath.row] lastName];
    return cell;
}

@end

Person *one = [Person new];
one.firstName = @"Allen";
one.lastName = @"X";

我想这里可以省略人h。 所以每次我编译并运行它时，它都会这样说：

我试了一千次都没弄明白为什么。有人能帮这个可怜的新手吗

因此，在遵循您的建议后，红色错误消失，但绿色错误出现。这是：

---

您尚未初始化并分配Person对象，然后您正试图填充其属性，因此显然会遇到访问冲突

换成这样：

#import "ViewController.h"
#import "customCell.h"
#import "Person.h"

@interface ViewController ()
@property RLMRealm *realm;
@property RLMResults *person;
@end

@implementation ViewController
@synthesize realm, person;
- (void)viewDidLoad {
    [super viewDidLoad];
    Person *one;
    one.firstName = @"Allen";
    one.lastName = @"X";
    realm = [RLMRealm defaultRealm];
    [realm beginWriteTransaction];
    [realm addObject:one];
    [realm commitWriteTransaction];
    self.person = [Person allObjects];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:   (NSInteger)section{
    return [person count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
    NSString *cellIdentifier = @"cellIdentifier";
    customCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    cell.firstName.text = [self.person[indexPath.row] firstName];
    cell.lastName.text = [self.person[indexPath.row] lastName];
    return cell;
}

@end

Person *one = [Person new];
one.firstName = @"Allen";
one.lastName = @"X";

---

请发布另一个问题，这不是一个论坛，而是一个问答格式，不管怎样，您仍然试图访问一个未正确初始化的对象。亲自删除断点。h