Cyy大神持久化存儲二維碼

咱們今天來講一下 ? 持久化存儲

先導入兩個第三方庫



導入以下依賴庫

AppDelegate.M

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

[UMessage startWithAppkey:@"your appkey" launchOptions:launchOptions];

//注冊通知,如果要使用category的自定義策略,可以參考demo中的代碼。

[UMessage registerForRemoteNotifications];

//iOS10必須加下面這段代碼。

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

center.delegate=self;

UNAuthorizationOptions types10=UNAuthorizationOptionBadge|? UNAuthorizationOptionAlert|UNAuthorizationOptionSound;

[center requestAuthorizationWithOptions:types10? ? completionHandler:^(BOOL granted, NSError * _Nullable error) {

if (granted) {

//點擊允許

//這里可以添加一些自己的邏輯

} else {

//點擊不允許

//這里可以添加一些自己的邏輯

}

}];

return YES;

}

-(void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken{

//1.2.7版本開始不需要用戶在手動注冊Devicetoken,SDK 會自動注冊

//[UMessage rigisterDeviceToken:deviceToken];

}

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo{

[UMessage didReceiveRemoteNotification:userInfo];

}

//iOS10新增:處理前臺收到通知的代理方法

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler{

NSDictionary *userInfo =notification.request.content.userInfo;

if ([notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {

//應用處于前臺時的遠程推送接受

//關閉U-Push自帶的彈出框

[UMessage setAutoAlert:NO];

//必須加這句代碼

[UMessage didReceiveRemoteNotification:userInfo];

}else{

//應用處于前臺時的本地推送接受

}

//當應用處于前臺時提示設置? 需要哪個可以設置哪一個

completionHandler(UNNotificationPresentationOptionSound|UNNotificationPresentationOptionBadge|UNNotificationPresentationOptionAlert);

}

//iOS10新增:處理后臺點擊通知的代理方法

-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler{

NSDictionary * userInfo = response.notification.request.content.userInfo;

if([response.notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {

//應用處于后臺時的遠程推送接受

//必須加這句代碼

[UMessage didReceiveRemoteNotification:userInfo];

}else{

//應用處于后臺時的本地推送接受

}

}


LoadData ? 添加查詢方法 ? 打開關閉數據庫


+(instancetype) shareLoadData;

//打開數據庫

-(void)openDataBase;

-(void)createDataBase;

-(void)addMusicData:(Model *)mod;

-(NSMutableArray *)selectDataBase;

//關閉數據庫

-(void)closeDataBase;

實現LoadData 方法

+(instancetype)shareLoadData{

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

ld = [[LoadData alloc]init];

});

return ld;

}

+(instancetype)allocWithZone:(struct _NSZone *)zone{

if (!ld) {

ld = [super allocWithZone:zone];

}

return ld;

}

-(id)copy{

return self;

}

-(id)mutableCopy{

return self;

}

-(void)openDataBase{

//創建沙盒路徑

NSString *str = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

NSLog(@"123123123%@",str);

//在沙盒路徑下創建一個db文件

NSString *path = [str stringByAppendingPathComponent:@"aiyo.db"];

NSLog(@"path == %@",path);

//如果存在直接打開 不存在 創建后打開

if (sqlite3_open([path UTF8String], &(sqliteDB)) == SQLITE_OK) {

NSLog(@"打開成功");

[self createDataBase];

}

}

//初始化數據庫? 創建數據庫

-(void)createDataBase{

//創建預編譯指針

const char *sqla? = "create table if not exists aiya (id integer primary key , image text)";

//將sql語句編譯到預編譯指針內部

sqlite3_stmt *stmt;

//執行預編譯指針

sqlite3_prepare(sqliteDB, sqla , -1, &stmt, nil);

if (sqlite3_step(stmt) == SQLITE_DONE) {

NSLog(@"創建成功");

}

//釋放預編譯指針

sqlite3_finalize(stmt);

}

//添加數據

-(void)addMusicData:(Model *)mod{

const char *sqla = "insert into aiya values(null,?)";

sqlite3_stmt *stmt;

sqlite3_prepare(sqliteDB, sqla, -1, &stmt, nil);

sqlite3_bind_text(stmt, 1, [mod.image UTF8String], -1, nil);

if (sqlite3_step(stmt) == SQLITE_DONE) {

NSLog(@"添加成功");

}

sqlite3_finalize(stmt);

}

//查詢數據

-(NSMutableArray *)selectDataBase{

const char *sqla = "select *from aiya";

sqlite3_stmt *stmt;

sqlite3_prepare(sqliteDB, sqla, -1, &stmt, nil);

NSMutableArray *Marr = [NSMutableArray array];

while (sqlite3_step(stmt) == SQLITE_ROW) {

Model *model = [[Model alloc]init];

model.image = [NSString stringWithUTF8String:(const char *)sqlite3_column_text(stmt, 1)];

data = [[NSData alloc]initWithBase64Encoding:model.image];

[Marr addObject:data];

NSLog(@"%ld ",Marr.count);

}

return Marr;

}

-(void)closeDataBase{

sqlite3_close(sqliteDB);

}

添加一個模型屬性

然后開始拖拽控件

#import "ViewController.h"

#import <CoreImage/CoreImage.h>

#import"QRCodeGenerator.h"

#import "LoadData.h"

#import "Model.h"

#import "TwoViewController.h"

@interface ViewController ()

{

Model *mod;

}

@property (weak, nonatomic) IBOutlet UITextField *text;

@property (weak, nonatomic) IBOutlet UIImageView *image;

@end

@implementation ViewController

- (IBAction)creat:(id)sender {

self.image.image = [QRCodeGenerator qrImageForString:self.text.text imageSize:self.image.bounds.size.width];

}

- (IBAction)baocun:(id)sender {

[[LoadData shareLoadData]openDataBase];

mod = [[Model alloc]init];

NSData *data = UIImageJPEGRepresentation(self.image.image, 0.5f);

mod.image = [data base64Encoding];

[[LoadData shareLoadData]addMusicData:mod];

[[LoadData shareLoadData]closeDataBase];

TwoViewController *two = [[TwoViewController alloc]init];

[self presentViewController:two animated:YES completion:nil];

}

開始創建表格用可變數組接收

_table = [[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];

_table.delegate = self;

_table.dataSource = self;

_table.rowHeight = 180;

[self.view addSubview:_table];

//自定義方法

[self select];

[_table reloadData];


-(void)select{

[[LoadData shareLoadData]openDataBase];

_Marr = [NSMutableArray array];

_Marr = [[LoadData shareLoadData]selectDataBase];

[[LoadData shareLoadData]closeDataBase];

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return _Marr.count;

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

static NSString *cellID = @"";

TwoTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];

if (!cell) {

cell = [[TwoTableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellID];

}

cell.img.image = [UIImage imageWithData:_Marr [indexPath.row]];

return cell;

}


創建一個UIImageView 添加到控件自定義Cell中


-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{

if (self =? [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {

[self.contentView addSubview:self.img];

}

return self;

}

-(UIImageView *)img{

if (!_img) {

_img = [[UIImageView alloc]initWithFrame:CGRectMake(25, 25, 130, 130)];

}

return _img;

}





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