在yourApp-Prefix.pch中加入你要引用的.h檔，即可以自動引用到每一個Class中

#import <Availability.h>

#ifndef __IPHONE_5_0

#warning "This project uses features only available in iOS SDK 5.0 and later."

#endif

#ifdef __OBJC__

    #import <UIKit/UIKit.h>

    #import <Foundation/Foundation.h>

#include "Define.h"    //<===加在這

#include "KSMacros.h"  //<===加在這

#include "Singleton.h" //<===加在這

#endif

可以在關閉App後仍能保存物件的NSUserDefaults

//儲存到NSUserDefaults 

-(void)saveNSUserDefaults 

{ 

NSString *myString = @"enuola"; 

int myInteger = 100; 

float myFloat = 50.0f; 

double myDouble = 20.0; 

NSDate *myDate = [NSDate date]; 

NSArray *myArray = [NSArray arrayWithObjects:@"hello", @"world", nil]; 

NSDictionary *myDictionary = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"enuo", @"20", nil] forKeys:[NSArray arrayWithObjects:@"name", @"age", nil]]; 

//將上面的物件儲存到NSUserDefaults中 

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 

//除NSNumber需用對應的型別以外，其他的都是使用setObject:forKey: 

[userDefaults setInteger:myInteger forKey:@"myInteger"]; 

[userDefaults setFloat:myFloat forKey:@"myFloat"]; 

[userDefaults setDouble:myDouble forKey:@"myDouble"]; 

[userDefaults setObject:myString forKey:@"myString"]; 

[userDefaults setObject:myDate forKey:@"myDate"]; 

[userDefaults setObject:myArray forKey:@"myArray"]; 

[userDefaults setObject:myDictionary forKey:@"myDictionary"]; 

//建議同步，但是不是必須的 

[userDefaults synchronize]; 

} 

//從NSUserDefaults讀取資料 

-(void)readNSUserDefaults 

{ 

NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults]; 

//讀取數據到各個label中 

//讀取整型int類型的數據 

NSInteger myInteger = [userDefaultes integerForKey:@"myInteger"]; 

txtInteger.text = [NSString stringWithFormat:@"%d",myInteger]; 

//讀取浮點型float類型的數據 

float myFloat = [userDefaultes floatForKey:@"myFloat"]; 

txtFloat.text = [NSString stringWithFormat:@"%f",myFloat]; 

//讀取double類型的數據 

double myDouble = [userDefaultes doubleForKey:@"myDouble"]; 

txtDouble.text = [NSString stringWithFormat:@"%f",myDouble]; 

//讀取NSString類型的數據 

NSString *myString = [userDefaultes stringForKey:@"myString"]; 

txtNSString.text = myString; 

//讀取NSDate日期類型的數據 

NSDate *myDate = [userDefaultes valueForKey:@"myDate"]; 

NSDateFormatter *df = [[NSDateFormatter alloc] init]; 

[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 

txtNSDate.text = [NSString stringWithFormat:@"%@",[df stringFromDate:myDate]]; 

//讀取數組NSArray類型的數據 

NSArray *myArray = [userDefaultes arrayForKey:@"myArray"]; 

NSString *myArrayString = [[NSString alloc] init]; 

for(NSString *str in myArray) 

{ 

NSLog(@"str= %@",str); 

myArrayString = [NSString stringWithFormat:@"%@ %@", myArrayString, str]; 

[myArrayString stringByAppendingString:str]; 

// [myArrayString stringByAppendingFormat:@"%@",str]; 

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

} 

txtNSArray.text = myArrayString; 

//讀取字典類型NSDictionary類型的數據 

NSDictionary *myDictionary = [userDefaultes dictionaryForKey:@"myDictionary"]; 

NSString *myDicString = [NSString stringWithFormat:@"name:%@, age:%d",[myDictionary valueForKey:@"name"], [[myDictionary valueForKey:@"age"] integerValue]]; 

txtNSDictionary.text = myDicString; 

}

在block中要使用self的正確方式

//在進去之前要把它設為weak，讓self消失時，block中的self也跟著消失

//在進之之後要把它設為strong，讓self在block執行時，不會自行消失

__weak typeof(self) weakSelf = self;

    [_bleManager setReadingValueCompletion:^(NSData *responseData) {

        __strong typeof(weakSelf) strongSelf = weakSelf;

        strongSelf.showResult.text = [NSString stringWithFormat:@"%@",responseData];

        [strongSelf.receivedData appendData:responseData];

    }];

//在swift中使用
weak let weakSelf = self
或者在closure開頭加上[weak self]
在closure裡就直接使用self?
例如

dispatch_async(dispatch_get_main_queue(), { [weak self] () -> Void in

            self?.chatMessageTableView.reloadData()

        })

從某字串以後重新抓取字串

NSRange search = [value rangeOfString:@"#*s$"];
value = [value substringFromIndex:search.location];

直接宣告為singleton的.h

到時只要import這個.h，就可以用這個方法宣告

#define SYNTHESIZE_SINGLETON_FOR_HEADER(className) \

\

+ (className *)shared##className;

#define SYNTHESIZE_SINGLETON_FOR_CLASS(className) \

\

+ (className *)shared##className { \

static className *shared##className = nil; \

static dispatch_once_t onceToken; \

dispatch_once(&onceToken, ^{ \

shared##className = [[self alloc] init]; \

}); \

return shared##className; \

}

iOS7似乎是little-endian

因為我一開始想對<dd07>做swap之後再印出數值，結果是65XXX多少的，後來把swap拿掉，就印出我真正想要的數字2013

//以下為程式碼

    NSData *myData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Test" ofType:@"bin"]];

    

    NSLog(@"myData:%@",myData);

    NSRange range = NSMakeRange(0, 2);

    NSLog(@"year data:%@",[myData subdataWithRange:range].description);

    NSData* yearData = [myData subdataWithRange:range];

    unsigned short x;

    [yearData getBytes:&x length:sizeof(x)];

    NSLog(@"x:%x",x);

    //unsigned short year = [self swap:x];

    NSLog(@"year:%hu",x);

year data:<dd07>

x:7dd

year:2013

-(UInt16) swap:(UInt16)s {

    NSLog(@"swap");

    UInt16 temp = s << 8;

    NSLog(@"%x",temp);

    temp |= (s >> 8);

    NSLog(@"%x",temp);

    return temp;

}

//20140207發現
iOS7在寫入時，不會自動換成little-endian
所以結論是，
讀取時，是以little-endian的方式直接讀取data
寫入時，是以data的格式直接寫入，所以要先swap成little-endian的排列，再寫入。

用NSData直接操作binary data

//下列這五個是你會用到的NSData方法

//將另一個NSData加到原來的NSData後面

-(void)appendData:(NSData*)otherData

//將bytes直接加入NSData,參數為1.bytes的起始位置(要加&),2.bytes的長度
-(void)appendBytes:(const void*)bytes length:(NSUInteger)length

//截取其中某一段NSData
-(NSData*)subdataWithRange:(NSRange)range

//從你的NSData中copy某段bytes出來，存到你新建的buffer（要加&）中（存數值資料，而非NSData）
-(void)getBytes:(void*)buffer range:(NSRange)range

//從你的NSData中從頭copy某段指定長度的bytes出來，存到你新建的buffer（要加&）中（存數值資料，而非NSData）
-(void)getBytes:(void*)buffer length:(NSUInteger)length

//底下是一些範例
//直接取得binary檔案
NSURL *imgPath = [[NSBundle mainBundle] URLForResource:@"yourBinary" withExtension:@"bin"];
        NSString *stringPath = [imgPath absoluteString];

        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:stringPath]];

//要把NSData轉回NSNumber時(這裡是以short為範例)
  short s;
  [yourData getBytes:&s range:range];
  NSNumber* stepCount = [NSNumber numberWithUnsignedShort:s];


// low level read method - read data while there is data and space available in the input buffer

- (void)_readData

{

    uint8_t buf[EAD_INPUT_BUFFER_SIZE];

    while ([[_session inputStream] hasBytesAvailable])

    {

        NSInteger bytesRead = [[_session inputStream] read:buf maxLength:EAD_INPUT_BUFFER_SIZE];

        if (_readData == nil)

        {

            _readData = [[NSMutableData alloc] init];

        }

        [_readData appendBytes:(void *)buf length:bytesRead];

        //NSLog(@"read %d bytes from input stream", bytesRead);

    }

    

    [[NSNotificationCenter defaultCenter] postNotificationName:EADSessionDataReceivedNotification object:self userInfo:nil];

    //清空_readData

    if( _readData )

    {

        [_readData setLength:0];

    }

}

// high level read method

// 這裡輸入的參數為你想要切的長度。

- (NSData *)readData:(NSUInteger)bytesToRead

{

    NSData *data = nil;

    if ([_readData length] >= bytesToRead)

    {

        NSRange range = NSMakeRange(0, bytesToRead);

        data = [_readData subdataWithRange:range];

        [_readData replaceBytesInRange:range withBytes:NULL length:0];

    }

    return data;

}

// get number of bytes read into local buffer

-(NSUInteger)readBytesAvailable

{

    return [_readData length];

}

//自己寫的切封包
+ (NSArray*)splitDataIntoChunks:(NSData*)data size:(NSUInteger)bytesPerChunk{

    

    if(!data) return nil;

    

    NSMutableArray* array = [[NSMutableArray alloc]init];
    NSUInteger dataLength = [data length];
    NSUInteger chunkCount = 0;
    while (chunkCount < dataLength)
    {
        NSRange range = NSMakeRange(chunkCount, bytesPerChunk);
        NSData* chunk = [data subdataWithRange:range];
        [array addObject:chunk];
        chunkCount += 2;
    }

    return array;

}