段老师的视频教程，采用都是比较通用是 Demo，方便以后代码复用。也是从项目实践经验来教授相关知识如 FMDB，这几节课获益匪浅。
Demo 源码见 Github，并添加了相关注释。
28. 沙盒机制
介绍几种数据持久化的方案，选择合适项目的方案：
- 沙盒机制
- NSFileManager
- Plist、Archive数据归档 * SQLite3应用
- NSUserDefaults
沙盒目录结构 NSDocumentDirectory：
- Application Bundle/
- Documents/
- Library/Caches/
- Library/Perferences/
- tmp/
29. NSFileManager & Plist
存取文档的方法封装一个通用的类BLUtility.h/m，方便调用。以下代码是测试保存文本文档。
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+ (NSString*) getPathWithinDocumentDir:(NSString*)aPath {
NSString *fullPath = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] > 0) {
fullPath = (NSString *)[paths objectAtIndex:0];
if ([aPath length] > 0) {
fullPath = [fullPath stringByAppendingPathComponent:aPath];
}
}
return fullPath;
}
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- (void)writeFileButtonClicked:(id)sender {
NSString *string = @"ABC副经理";
NSString *stringFilePath = [BLUtility getPathWithinDocumentDir:@"string.text"];
[BLUtility createDirectory:stringFilePath lastComponentIsDirectory:NO];
[string writeToFile:stringFilePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
}
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30. Archive 数据归档和 NSUserDefaults
转化为 NSData，二进制的数据，利于存储和传输。
遵循 NSCoding 协议，即可实现编码和解码的类，进一步对其归档和解档。也用到了封装的类BLUtility.h/m。本例中文档保存到 NSUserDefaults：
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- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super init];
if (self) {
self.userName = [aDecoder decodeObjectForKey:@"userName"];
self.email = [aDecoder decodeObjectForKey:@"email"];
self.password = [aDecoder decodeObjectForKey:@"password"];
self.age = [aDecoder decodeIntForKey:@"age"];
}
return self;
}
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+ (NSObject *) unarchiverObject:(NSData *)archivedData withKey:(NSString *)key {
if(archivedData == nil) {
return nil;
}
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:archivedData];
NSObject *object = [unarchiver decodeObjectForKey:key];
[unarchiver finishDecoding];
return object;
}
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- (void) readButtonClicked:(id)sender {
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSInteger test = [userDefaults integerForKey:@"integer"];
NSLog(@"test = %li", test);
NSString *userDataPath = [BLUtility getPathWithinDocumentDir:UserDataName];
if ([userDataPath length] > 0 && [[NSFileManager defaultManager] fileExistsAtPath:userDataPath]) {
NSData *userData = [NSData dataWithContentsOfFile:userDataPath];
BLUser *user = (BLUser *)[BLUtility unarchiverObject:userData withKey:@"UserData"];
_userNameTextField.text = user.userName;
_emailTextField.text = user.email;
_passwordTextField.text = user.password;
_ageTextField.text = [NSString stringWithFormat:@"%ld", user.age];
}
}
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###延伸阅读：
31. SQLite3
通过 FMDB 封装，得以 OBjective-C 访问 SQLite，完成常用增删改查。从语法和数据体积实现轻量级存储方案。这个方案稍后用在习题“同学录”上实践一下。
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#import <Foundation/Foundation.h>
#import "FMDatabase.h"
#import "BLPoem.h"
@interface BLPoemDB : NSObject {
FMDatabase *_db;
}
- (BOOL) createPoemTable;
- (BOOL) addPoem:(BLPoem *)poem;
- (NSMutableArray *) getAllPoems;
- (NSMutableArray *) getFavoritesPoems;
- (BOOL) setFavorite:(BOOL)favorite favoriteId:(NSInteger)poemId;
- (BOOL) deletePoemWithPoemId:(NSInteger)poemId;
@end
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#import "BLPoemDB.h"
#import "BLUtility.h"
#define BLPOEMDBNAME @"BLPoemDB.sqlite"
@implementation BLPoemDB
-(id) init {
self = [super init];
if (self) {
NSString *dbPath = [BLUtility getPathWithinDocumentDir:BLPOEMDBNAME];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL existFile = [fileManager fileExistsAtPath:dbPath];
if (existFile == NO) {
NSString *poemDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:BLPOEMDBNAME];
[fileManager copyItemAtPath:poemDBPath toPath:dbPath error:nil];
}
_db = [[FMDatabase alloc] initWithPath:dbPath];
if ([_db open] == NO) {
return nil;
}
}
return self;
}
- (BOOL) createPoemTable {
[_db beginTransaction];
BOOL success = [_db executeUpdate:@"CREATE TABLE IF NOT EXISTS POEMTABLE ("
@"ID INTEGER PRIMARY KEY NOT NULL,"
@"POEMNAME TEXT NOT NULL,"
@"POETNAME TEXT NOT NULL,"
@"POEMCONTENT TEXT NOT NULL,"
@"WHETHERFAVORITE BOOL NOT NULL);"];
[_db commit];
if(!success || [_db hadError]) {
[_db rollback];
return NO;
}
return YES;
}
- (BOOL) addPoem:(BLPoem *)poem {
FMResultSet *rs = [_db executeQuery:@"SELECT ID FROM POEMTABLE WHERE ID=?", [NSNumber numberWithInteger:poem.poemId]];
if(rs && [rs next]) {
[rs close];
return YES;
}
[rs close];
[_db beginTransaction];
NSString *bookMark = nil;
BOOL success = [_db executeUpdate:@"INSERT OR IGNORE INTO POEMTABLE (ID,POEMNAME,POETNAME,POEMCONTENT,WHETHERFAVORITE) VALUES (?,?,?,?,?);",
[NSNumber numberWithInteger:poem.poemId],
poem.poemName,
poem.poetName,
poem.poemContent,
[NSNumber numberWithBool:poem.whetherFavorite],
bookMark];
[_db commit];
if(!success || [_db hadError]) {
[_db rollback];
return NO;
}
return YES;
}
- (NSMutableArray *) getAllPoems {
NSMutableArray *result = [[NSMutableArray alloc] init];
FMResultSet *rs = [_db executeQuery:@"SELECT * FROM POEMTABLE"];
while([rs next]) {
BLPoem *poem = [[BLPoem alloc] init];
poem.poemId = [rs intForColumn:@"ID"];
poem.poemName = [rs stringForColumn:@"POEMNAME"];
poem.poetName = [rs stringForColumn:@"POETNAME"];
poem.poemContent = [rs stringForColumn:@"POEMCONTENT"];
poem.whetherFavorite = [rs boolForColumn:@"WHETHERFAVORITE"];
[result addObject:poem];
}
[rs close];
return result;
}
- (NSMutableArray *) getFavoritesPoems {
NSMutableArray *result = [[NSMutableArray alloc] init];
FMResultSet *rs = [_db executeQuery:@"SELECT * FROM POEMTABLE WHERE WHETHERFAVORITE=?", [NSNumber numberWithBool:YES]];
while([rs next]) {
BLPoem *poem = [[BLPoem alloc] init];
poem.poemId = [rs intForColumn:@"ID"];
poem.poemName = [rs stringForColumn:@"POEMNAME"];
poem.poetName = [rs stringForColumn:@"POETNAME"];
poem.poemContent = [rs stringForColumn:@"POEMCONTENT"];
poem.whetherFavorite = [rs boolForColumn:@"WHETHERFAVORITE"];
[result addObject:poem];
}
[rs close];
return result;
}
- (BOOL) setFavorite:(BOOL)favorite favoriteId:(NSInteger)poemId {
if (_db == nil) {
return NO;
}
[_db beginTransaction];
BOOL result = [_db executeUpdate:@"UPDATE POEMTABLE SET WHETHERFAVORITE=? WHERE ID=?", [NSNumber numberWithBool:favorite], [NSNumber numberWithInteger:poemId]];
[_db commit];
return result;
}
- (BOOL) deletePoemWithPoemId:(NSInteger)poemId {
[_db beginTransaction];
BOOL success = [_db executeUpdate:@"DELETE FROM POEMTABLE WHERE ID=?", [NSNumber numberWithInteger:poemId]];
[_db commit];
if(!success || [_db hadError]) {
[_db rollback];
return NO;
}
return YES;
}
- (void) dealloc {
[_db close];
_db = nil;
}
@end
|
延伸阅读：
32. 多线程和多媒体
简单介绍了常见多媒体的播放：
- UIImagePickerViewController
- UIActionSheet （👈名字谐音）
- AVAudioPlayer
- SystenSounID
- MPMoviePlayerViewController
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| #import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <MediaPlayer/MediaPlayer.h>
@interface BLOneViewController ()<UIAlertViewDelegate, UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate> {
AVAudioPlayer *audioPlayer;
SystemSoundID systemSoundId;
}
#pragma mark - Play Music button action
- (IBAction)palyMusic:(UIButton *)sender {
if (!audioPlayer) {
NSString *mp3Path = [[NSBundle mainBundle] pathForResource:@"yishengsuoai" ofType:@"mp3"];
NSURL *mp3Url = [[NSURL alloc] initFileURLWithPath:mp3Path];
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:mp3Url error:NULL];
audioPlayer.numberOfLoops = -1;
[audioPlayer prepareToPlay];
}
if ([audioPlayer isPlaying]) {
[audioPlayer stop];
sender.titleLabel.text = @"Play Music";
}else {
[audioPlayer play];
sender.titleLabel.text = @"Pasue Music";
}
}
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33. 硬件访问、CALayer & Core Graphics
33.1. gravity and user acceleration
Useage: shaking device to feedback or 360° image
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NSOperationQueue *diviceMotionQueue = [[NSOperationQueue alloc] init];
[self.motionManager startDeviceMotionUpdatesToQueue:diviceMotionQueue
withHandler:^(CMDeviceMotion *motion, NSError *error) {
NSLog(@"\n \n-------------------------------------------------------------------------->\n \n 1 - attitude: %@ \n 2 - rotation rate x: %f, y: %f, z: %f,\n \n 3 - gravity x: %f, y: %f, z: %f \n \n 4 - user acceleration x: %f, y: %f, z: %f \n \n 5 - magnetic field accuracy: %d, x: %f, y: %f, z: %f \n \n <--------------------------------------------------------------------------\n \n" ,
motion.attitude,
motion.rotationRate.x, motion.rotationRate.y, motion.rotationRate.z,
motion.gravity.x, motion.gravity.y, motion.gravity.z,
motion.userAcceleration.x, motion.userAcceleration.y, motion.userAcceleration.z,
motion.magneticField.accuracy, motion.magneticField.field.x, motion.magneticField.field.y, motion.magneticField.field.z);
}];
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Search the definiton of each new word, really 😄😄😄.
Do you believe that, At least I don’t think so.
Output:
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| -------------------------------------------------------------------------->
1 - attitude: CMAttitude Pitch: 0.751292, Roll: 0.555726, Yaw: 22.198534
2 - rotation rate x: 0.001511, y: -0.000795, z: 0.002454,
3 - gravity x: 0.009698, y: -0.013112, z: -0.999867
4 - user acceleration x: -0.002603, y: 0.000783, z: -0.014095
5 - magnetic field accuracy: -1, x: 0.000000, y: 0.000000, z: 0.000000
<--------------------------------------------------------------------------
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33.2. CALayer
Modifying the Layer’s Appearance Properties.
Lots of properties really similar to Sketch.
33.3. Core Graphics
CGContextRef: An opaque type that represents a Quartz 2D drawing environment.
Path on CGContextRef vs Vector on Artboard in Sketch, by learn Sketch really make sense of those abstract concepts.
34. 自定义手势、Block & GCD
34.1. 手势
尽量设计使用常用的手势
设计一个小 Demo，实现：Shake Your iPhone To Send Feedback Email To Me😄
34.2. Block
比较简洁的函数，就在当前就可以调用。
34.3. GCD
Group queue：并行执行多任务比较牛。
35. APNS、Core Date、URL Scheme、单元测试、APP发布流
35.1. APNS
稍后添加到 Classmates
35.2. Core Data
核心概念：
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@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
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稍后把 Classmate 整个 Core Data 的版本
35.3. URL Scheme
就是一个通过个地址访问系统软件或第三方软件，如地图和 Launch Center Pro。iOS 9之后估计有更多可能性。
35.4. 单元测试或断点测试
35.5. App 发布流程