本文中将简单介绍几个笔者认为在开发中很有用的iOS开源类库及其简单使用方法
1: SBJson
SBJson, 又名Json Framework, 是一个非常流行的,开源的JSON解析类库。SBJSon的使用非常简单,为在网络中传输与解析格式化的数据提供了极大的便利。
SBJson的使用也很简单,在项目中将类库文件添加到项目中,然后加入几个依赖的FrameWork,目前比价稳定的有ARC3.1版本的和非ARC版本的3.0,大家可以根据自身需要进行下载。
下面就SBJson的使用进行简单介绍:
- #import "SBJSon.h"
-
-
- SBJsonWriter* jsonWriter = [[[SBJsonWriter alloc] init] autorelease];
- NSMutableArray* tempArray = [NSMutableArray array];
- NSDictionary* tempDicA = [NSMutableDictionary dictionary];
- [tempDicA addObject @"valueA" forKey @"keyA"];
- [tempArray addObject: tempDicA];
- NSDictionary* tempDicB = [NSMutableDictionary dictionary];
- [tempDicB addObject @"valueB" forKey @"keyB"];
- [tempArray addObject: tempDicB];
- NSMutableDictionary* jsonDic = [NSMutableDictionary dictionary];
- [jsonDic setObject: tempArray forKey: @"array"];
- NSString* jsonString = [jsonWriter stringWithObject: jsonDic];
-
-
- NSDictionary* resultDic = [jsonString JSONValue];
- NSArray* resultArray = [resultDic objectForKey @"array"];
- NSDictionary* dicA = [resultArray objectAtIndex: 0];
- NSDictionary* dicB = [resultArray objectAtIndex: 1];
- NSLog(@"%@, %@" [dicA objectForKey @"keyA", [dicB objectForKey: @"keyB"]);
2: ASIHTTPRequest
ASIHTTPRequest是一个非常流行的iOS平台网络通信类库,使用ASIHTTPRequest之后,大大简化了iOS平台的网络编程。其以方便的接口对同步、异步的网络传输进行了传输,将ASIHTTPRequest添加到自己的项目也非常方便,将类库中所有文件拷贝到一个文件夹中,然后将此文件夹添加到项目中,同时要添加如下图CFNetWork之下所示的类库,就可以使用ASIHTTPRequest了:
使用ASIHTTPRequest步骤非常简答,在一般应用开发中,网络连接基本上使用的都是异步方式,下面简单演示一下最简单的异步通讯方法
- #import "ASIHTTPRequest.h"
-
- - (void) requestDataFromServer
- {
- NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
- NSURL* url = [NSURL URLWithString: @"www.fakeurl.com"];
- ASIHTTPRequest* request = [ASIHTTPRequest requestWithURL: url];
- [request setTag: 1024];
- [request setTimeOutSeconds: 3];
- [request setAllowCompressedResponse:YES];
- [request setDelegate:self];
- [request startAsynchronous];
- [pool drain];
- }
-
- - (void)requestFinished:(ASIHTTPRequest *)request
- {
- NSString* rawString = [request responseString];
- if (request.tag == 1024) {
-
- }
- }
-
- - (void)requestFailed:(ASIHTTPRequest *)request
- {
- if (request.tag == 1024) {
-
- }
- }
注意上面的两个函数中,后面连个为ASIHTTPRequest的delegate函数,其声明类型不能改变,只要在生成ASIHTTPRequest时的deleage设成了self,那么最后返回结果,不管是成功调用还是网络失败,都会调用这两个函数中的对应的一个。
3: FMDataBase
FMDataBase是iOS平台中一个非常强大的数据库类库,其将sqlite面向过程的接口以面向对象的方法展现出来,提供了极高的可用性。
其使用很简单,将sqlite 库添加到项目中,然后将FMDataBase类库文件添加到项目中,下面是对笔者对FMDataBase进行的一个二次封装,处理的数据库很简单,只有一张表,两个列,存储的都是一些key-value对,读者可以根据自身需要对此类进行修改。
- #import <Foundation/Foundation.h>
- #import "FMDatabase.h"
- @interface DBController : NSObject {
- }
-
- @property (nonatomic, assign) FMDatabase *dataBase;
-
- +(BOOL)databaseExit;
-
- -(BOOL)initDatabase;
-
- -(void)closeDatabase;
-
- -(BOOL)deleteTable;
-
- -(BOOL)InsertTable:(NSString *)key_type value:(NSString *)key_value;
-
- -(BOOL)UpdataTable:(NSString *) valueStr key:(NSString *)keyStr;
-
- -(NSMutableDictionary *)querryTable;
-
- +(BOOL) deleteDataBase;
-
- @end
-
- @synthesize dataBase = _dataBase;
-
- - (id)init{
-
- if(self = [super init]){
- _dataBase = [FMDatabase databaseWithPath: [DBController getPath]];
- if (![_dataBase open]) {
- NSLog(@"Create/Open dataBase %@ Failed!", [DBController getPath]);
- }
- }
- return self;
- }
-
-
- +(BOOL)databaseExit
- {
- return [[NSFileManager defaultManager] fileExistsAtPath: [self getPath]];
- }
-
-
-
- -(BOOL)initDatabase{
- if ([DBController databaseExit]) {
- return [self createTable];
- }
- return NO;
- }
-
-
-
-
- -(BOOL)createTable
- {
- return [self.dataBase executeUpdate: @"create table if not exists personTable(id integer primary key autoincrement, key text,value text);"];
- }
-
-
- -(BOOL)deleteTable{
- if ([DBController databaseExit]) {
- return [self.dataBase executeUpdate: [NSString stringWithFormat:@"drop table %@;",_PERSONINFO]];
- }
- return NO;
- }
-
-
-
-
- - (void) closeDatabase
- {
- [self.dataBase close];
- }
-
-
- -(BOOL)InsertTable:(NSString *)key value:(NSString *)value
- {
- if ([DBController databaseExit]) {
- BOOL result = NO;
- [self.dataBase beginTransaction];
- result = [self.dataBase executeUpdate:@"INSERT INTO personTable (key,value) VALUES (?,?)", key, value];
- [self.dataBase commit];
- return result;
- }
- return NO;
- }
-
-
- -(BOOL)UpdataTable:(NSString *) valueStr key:(NSString *)keyStr
- {
- if ([DBController databaseExit]) {
- BOOL result = NO;
- [self.dataBase beginTransaction];
- result = [self.dataBase executeUpdate:@"UPDATE personTable SET value=? WHERE key=?", valueStr, keyStr];
- [self.dataBase commit];
- return result;
- }
- return NO;
- }
-
-
- -(NSMutableDictionary *)querryTable
- {
- NSMutableDictionary* resultDic = [[NSMutableDictionary alloc] init];
-
- FMResultSet *rs = [self.dataBase executeQuery:@"select * from personTable"];
- while ([rs next]) {
- [resultDic setObject: [rs stringForColumn: @"value"] forKey: [rs stringForColumn: @"key"]];
- }
- return [resultDic autorelease];
- }
-
- +(BOOL) deleteDataBase
- {
- NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
-
- NSString *documentsDirectory = [paths objectAtIndex:0];
-
- NSString *path = [documentsDirectory stringByAppendingPathComponent:_DBNAME];
-
- NSFileManager *fileManager = [NSFileManager defaultManager];
-
- BOOL find = [fileManager fileExistsAtPath:path];
-
- if (find) {
-
- [fileManager removeItemAtPath: path error: nil];
-
- }
- return find;
- }
-
-
- - (void)dealloc {
- [_dataBase close];
- _dataBase = nil;
- [super dealloc];
- }
-
- + (NSString*) getPath {
-
- NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
-
- NSString *documentsDirectory = [paths objectAtIndex:0];
-
- return [documentsDirectory stringByAppendingPathComponent:_DBNAME];
- }
-
-
- @end
4: MPProgressHUD
MPProgressHUD是一个非常好用的进度指示器类库,其提供了苹果官方sdk没有提供的progress indicator接口,且提供多种样式,使用方法简便。
首先将类库文件添加到项目中。
使用实例代码如下:
- #import <UIKit/UIKit.h>
- #import "MBProgressHUD.h"
- #import <libkern/OSAtomic.h>
- @interface SampleViewController : UITableViewController <MBProgressHUDDelegate>
- @property (nonatomic, retain) NSCondition* condition;
- @property (nonatomic, retain) MBProgressHUD* hud;
- @end
-
- static volatile NSInteger WAITING_RESPONSE_FOR_SERVERRESPONSE = 0;
-
- - (void) popOutMBProgressHUD;
- - (void) selectorForMPProgressHUD;
- - (void) notifyMPProgressHUDToDisappear;
-
- @implementation SampleViewController
- @synthesize hud = _hud;
- @synthesize condition = _condition;
-
- - (id) initWithCoder:(NSCoder *)aDecoder
- {
- self = [super initWithCoder: aDecoder];
- if (self != nil) {
- _hud = nil;
- _condition = [[NSCondition alloc] init];
- }
- return self;
- }
-
- - (void) dealloc
- {
- [_hud release];
- [_condition release];
- }
-
- - (void) popOutMBProgressHUD
- {
- MBProgressHUD* tempHud = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
- self.hud = tempHud;
- [self.navigationController.view addSubview: tempHud];
-
- self.hud.dimBackground = YES;
- self.hud.delegate = self;
- self.hud.labelText = @"正在处理";
- [self.hud showWhileExecuting:@selector(selectorForMPProgressHUD) onTarget:self withObject: nil animated:YES];
- [tempHud release];
- }
-
- - (void) selectorForMPProgressHUD
- {
- OSAtomicCompareAndSwapInt(0,
- 1,
- &WAITING_RESPONSE_FOR_SERVERRESPONSE);
- [self performSelectorInBackground: @selector(tempSelector) withObject: nil];
- [self.condition lock];
- while (OSAtomicCompareAndSwapInt(1,
- 1,
- &WAITING_RESPONSE_FOR_SERVERRESPONSE)) {
- NSDate* timeOutDate = [NSDate dateWithTimeIntervalSinceNow: 5.0f];
- [self.condition waitUntilDate: timeOutDate];
- }
- [self.condition unlock];
- }
-
- - (void) notifyMPProgressHUDToDisappear
- {
-
- [self.condition lock];
- OSAtomicCompareAndSwapInt(1,
- 0,
- &WAITING_RESPONSE_FOR_SERVERRESPONSE);
- [self.condition signal];
- [self.condition unlock];
- }
- - (void)hudWasHidden:(MBProgressHUD *)hud
- {
-
- [self.hud removeFromSuperview];
- self.hud = nil;
- }
-
- - (void) tempSelector
- {
- sleep(3.0f);
- [self notifyMPProgressHUDToDisappear];
- }
-
- @end