首先下载Realm源代码，https://realm.io/cn/docs/objc/latest
将下载的文件解压，从 ios/static/ 目录中将 Realm.framework 拖曳到 Xcode 工程的文件导航器内，然后在 Xcode 文件导航器中选中工程。然后选择应用目标，前往 Build Phases 选项卡。在 Link Binary with Libraries 部分中单击 + 按钮，然后添加 libc++.tbd 和 libz.tbd。这样还没有完，我们还需要安装插件，打开解压文件夹下的plugin，运行RealmPlugin.xcodeproj，然后重启XCode。
这样环境配置就完了，现在说重点如何去使用。
1.创建实体类
new File翻到最下面点击创建Realm实体类
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#import <Realm/Realm.h>@interface TestBean : RLMObject@property NSString* name;@property NSInteger age;@end// This protocol enables typed collections. i.e.:// RLMArray<TestBean *><TestBean>RLM_ARRAY_TYPE(TestBean)#import "TestBean.h"@implementation TestBean@end |
2.增删改查
这个增加，可以看到直接添加实体类就行了，这个RLMRealm就是数据库的操作类，以后所有操作都靠他。
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-(void)addAction{ NSLog(@"add"); self.name = _tf_name.text; self.age = [_tf_age.text integerValue]; TestBean* bean = [[TestBean alloc]init]; bean.name = self.name; bean.age = self.age; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{ [realm addObject:bean]; }];} |
删除也是通过删除实体类来实现，但是我们需要首先通过查询出实体类才行。这个查询我们可以看到通过我们创建的实体类就能实现
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-(void)deleteAction{ NSLog(@"delete"); RLMResults *dogs = [TestBean allObjects]; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{ for (TestBean *bean in dogs) { [realm deleteObject:bean]; } }];} |
更新也是通过改变实体类的数据来实现
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-(void)updateAction{ NSLog(@"update"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{ for (TestBean *bean in dogs) { bean.name = @"李四"; } }];} |
查询我们还可以添加条件
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// 使用断言字符串来查询RLMResults<Dog *> *tanDogs = [Dog objectsWhere:@"color = 'tan' AND name BEGINSWITH 'B'"];// 使用 NSPredicate 来查询NSPredicate *pred = [NSPredicate predicateWithFormat:@"color = %@ AND name BEGINSWITH %@", @"tan", @"B"];tanDogs = [Dog objectsWithPredicate:pred]; |
3.排序
这个是在查询完后去实现，通过实体类的key来排序。
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-(void)sortAction{ NSLog(@"query"); RLMResults *dogs = [[TestBean allObjects] sortedResultsUsingKeyPath:@"name" ascending:YES]; [[RLMRealm defaultRealm] transactionWithBlock:^{ for (TestBean *bean in dogs) { NSLog(@"%@",bean.name); } }];} |
4.小结
只说了常用的功能，贴上官方中文文档供大家参考
https://realm.io/cn/docs/objc/latest
5.例子代码
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//// ViewController.m// BmobTest//// Created by shanreal-iOS on 2017/12/9.// Copyright © 2017年 shanreal.LongZhenHao. All rights reserved.//#import "ViewController.h"#import "TestBean.h"@interface ViewController ()@property(nonatomic,strong)UIButton* add;@property(nonatomic,strong)UIButton* delete;@property(nonatomic,strong)UIButton* update;@property(nonatomic,strong)UIButton* query;@property(nonatomic,strong)UIButton* sort;@property(nonatomic,strong)NSString* name;@property(nonatomic,assign)NSInteger* age;@property(nonatomic,strong)UITextField* tf_name;@property(nonatomic,strong)UITextField* tf_age;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. _add = [[UIButton alloc]initWithFrame:CGRectMake(10, 30, 100, 20)]; [_add setTitle:@"add" forState:UIControlStateNormal]; [_add setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_add addTarget:self action:@selector(addAction) forControlEvents:UIControlEventTouchUpInside]; _delete = [[UIButton alloc]initWithFrame:CGRectMake(10, 60, 100, 20)]; [_delete setTitle:@"delete" forState:UIControlStateNormal]; [_delete setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_delete addTarget:self action:@selector(deleteAction) forControlEvents:UIControlEventTouchUpInside]; _update = [[UIButton alloc]initWithFrame:CGRectMake(10, 90, 100, 20)]; [_update setTitle:@"update" forState:UIControlStateNormal]; [_update setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_update addTarget:self action:@selector(updateAction) forControlEvents:UIControlEventTouchUpInside]; _query = [[UIButton alloc]initWithFrame:CGRectMake(10, 120, 100, 20)]; [_query setTitle:@"query" forState:UIControlStateNormal]; [_query setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_query addTarget:self action:@selector(queryAction) forControlEvents:UIControlEventTouchUpInside]; _sort = [[UIButton alloc]initWithFrame:CGRectMake(10, 150, 100, 20)]; [_sort setTitle:@"sort" forState:UIControlStateNormal]; [_sort setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [_sort addTarget:self action:@selector(sortAction) forControlEvents:UIControlEventTouchUpInside]; _tf_name = [[UITextField alloc]initWithFrame:CGRectMake(50, 300, 200, 20)]; _tf_name.placeholder=@"name"; _tf_age = [[UITextField alloc]initWithFrame:CGRectMake(50, 350, 200, 20)]; _tf_age.placeholder=@"age"; [self.view addSubview:_add]; [self.view addSubview:_delete]; [self.view addSubview:_update]; [self.view addSubview:_query]; [self.view addSubview:_sort]; [self.view addSubview:_tf_name]; [self.view addSubview:_tf_age];}-(void)addAction{ NSLog(@"add"); self.name = _tf_name.text; self.age = [_tf_age.text integerValue]; TestBean* bean = [[TestBean alloc]init]; bean.name = self.name; bean.age = self.age; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{ [realm addObject:bean]; }];}-(void)deleteAction{ NSLog(@"delete"); RLMResults *dogs = [TestBean allObjects]; RLMRealm *realm = [RLMRealm defaultRealm]; [realm transactionWithBlock:^{ for (TestBean *bean in dogs) { [realm deleteObject:bean]; } }];}-(void)updateAction{ NSLog(@"update"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{ for (TestBean *bean in dogs) { bean.name = @"李四"; } }];}-(void)queryAction{ NSLog(@"query"); RLMResults *dogs = [TestBean allObjects]; [[RLMRealm defaultRealm] transactionWithBlock:^{ for (TestBean *bean in dogs) { NSLog(@"%@",bean.name); } }];}-(void)sortAction{ NSLog(@"query"); RLMResults *dogs = [[TestBean allObjects] sortedResultsUsingKeyPath:@"name" ascending:YES]; [[RLMRealm defaultRealm] transactionWithBlock:^{ for (TestBean *bean in dogs) { NSLog(@"%@",bean.name); } }];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end |
以上这篇基于iOS Realm数据库的使用实例详解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/z979451341/article/details/78790419
