iOS:以前笔记，未整理版。太多了，先放着吧。。。。。。。

1、

-(void)timetick

{

_d = 0;

NSTimer *newtime =[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(printfdate:) userInfo:@"byL" repeats:YES];

}

-(void)printfdate:(NSTimer*)time1

{

NSLog(@"%d,%@",_d++,time1.userInfo);

}

[newtime invalidate];

[[NSRunLoop currentRunLoop]run];

//初始化观察

[_phone addObserver:self forKeyPath:@"price" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];

//观察到变化控制

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context

{

NSNumber *num = [change objectForKey:@"new"];

NSLog(@"%@",num);

}

//发送信息

[[NSNotificationCenter defaultCenter]postNotificationName:@"pricechange" object:self userInfo:nil];

//接受信息初始化

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(salephone) name:@"pricechange" object:nil];

//接受到信息做控制

-(void)salephone

//数组

NSArray *DATA_A =@[类,类,类,类,类];

//设置过滤条件

NSPredicate *newpre = [NSPredicate predicateWithFormat:@"age > 29"];

//过滤后保存的数组

NSArray *newarray = [DATA_A filteredArrayUsingPredicate:newpre];

@“name BEGINSWITH 'x' ”

@“name ENDSWITH 'x' ”

@“name CONTAINS 'x' ”

@“age > 29 || age < 20”

@“name like ‘?d*’ ”

2、

sql

====================================================================

创建：

打开： 数据库指针、保存地址

sqlite3_open([path UTF8String], &new_sql)

————————————————————————————————————————

创建： 数据库指针、创建指令、错误指令

(

NSString *command = @"CREATE TABLE IF NOT EXISTS UserTable (username TEXT primary key,password TEXT,age TEXT)";

)

sqlite3_exec(new_sql, [command UTF8String], NULL, NULL, &new_error)

————————————————————————————————————————

关闭： 数据库指针

sqlite3_close(new_sql);

====================================================================

插入：

打开：

同

————————————————————————————————————————

插入指令：

(

NSString *op = @"INSERT INTO UserTable(username,password,age) VALUES (?,?,?)";

)

准备： 数据库指针、插入指令、句柄

sqlite3_prepare(new_sql, [op UTF8String], -1, &new_stmt, NULL);

绑定： 句柄、位置、数据

sqlite3_bind_text(new_stmt, 1, [name UTF8String], -1, NULL);

下一步： 句柄

sqlite3_step(new_stmt);

结束： 句柄

sqlite3_finalize(new_stmt);

————————————————————————————————————————

关闭：

同

====================================================================

删除：

打开：

同

————————————————————————————————————————

删除指令：

(

NSString *op = @"DELETE FROM userTable WHERE userName = ?";

)

准备： 数据库指针、删除指令、句柄

sqlite3_prepare(new_sql, [op UTF8String], -1, &new_stmt, NULL);

绑定： 句柄、位置、数据

sqlite3_bind_text(new_stmt, 1, [name UTF8String], -1, NULL);

下一步： 句柄

sqlite3_step(new_stmt);

结束： 句柄

sqlite3_finalize(new_stmt);

————————————————————————————————————————

关闭：

同

====================================================================

选择：

打开：

同

————————————————————————————————————————

选择指令：

(

（1）NSString *op = @"SELECT username,password,age From UserTable where username = ?";

（2）NSString *op = @"SELECT username,password,age From UserTable";

)

准备： 数据库指针、选择指令、句柄

sqlite3_prepare(new_sql, [op UTF8String], -1, &new_stmt, NULL);

绑定： 句柄、位置、数据

（1）sqlite3_bind_text(new_stmt, 1, [selet_name UTF8String], -1, NULL);

下一步： 句柄

sqlite3_step(new_stmt);

遍历：

while (result == SQLITE_ROW)

{

char *c_name = (char *)sqlite3_column_text(new_stmt, 0);

char *c_password = (char *)sqlite3_column_text(new_stmt, 1);

char *c_age = (char *)sqlite3_column_text(new_stmt, 2);

NSString *s_name = [NSString stringWithCString:c_name encoding:NSUTF8StringEncoding];

NSString *s_password = [NSString stringWithCString:c_password encoding:NSUTF8StringEncoding];

NSString *s_age = [NSString stringWithCString:c_age encoding:NSUTF8StringEncoding];

NSLog(@"%@,%@,%@",s_name,s_password,s_age);

result = sqlite3_step(new_stmt);

//NSLog(@"%d",new_stmt);

}

结束： 句柄

sqlite3_finalize(new_stmt);

————————————————————————————————————————

关闭：

同

====================================================================

插入变体：

更新

@"UPDATE UserTable SET password = ? where username = ?"

选择（2）变体：

排序

@“SELECT * FROM userTable ORDER BY age ASC（DESC）”

3、

@"dogs.@sum.weight"

@"dogs.@avg.weight"

@"dogs.@min.weight"

@"dogs.@max.weight"

4、

int gNumb=0;

全局变量通常用小写g来提示。

重写，父类有声明，不必再声明

[p1 isKindOfClass:[Person class]];

[p1 isMemberOfClass:[Person class]];

[p1 respondsToSelector:@selector(test)];

可变数组 copy 赋值给不可变数组。

-(NSString *)description

{

return [NSString stringWithFormat:@"%@,%lu",_name,_price];

}

==========================================================================

//编码

NSData *new_data = [s_text dataUsingEncoding:NSUTF8StringEncoding];

//解码

NSString *new_string = [[NSString alloc]initWithData:new_data encoding:NSUTF8StringEncoding];

==========================================================================

//沙盒路径

NSHomeDirectory()

//工程目录

[NSBundle mainBundle]

==========================================================================

//弄个文件管理

NSFileManager *new_File = [NSFileManager defaultManager];

//创建文件夹   path要追加文件夹名，不要后缀

[new_File createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&new_error]

//创建文件   path在之前文件夹下追加“xxx.xxx”    data要编码

[new_File createFileAtPath:new_path contents:new_data attributes:nil]

//读取文件的信息 返回字典

[new_File attributesOfItemAtPath:new_path error:&new_error]

//读取单个字典的关键词

[new_dic objectForKey:@"NSFileSize"]

==========================================================================

//文件读取

NSData *newData = [fileManager contentsAtPath:filePath];

[[NSString alloc]initWithData:newData encoding:NSUTF8StringEncoding];

or

[[NSString alloc]initWithContentsOfFile:new_path encoding:NSUTF8StringEncoding error:&new_error];

//文件移动（剪切、重命名），要加上文件名和后缀”xxx.xx”

[new_File moveItemAtPath:new_path toPath:ob_add error:&new_error]

//文件复制   也要注意有文件名和后缀“xxx.xx”

[new_File copyItemAtPath:new_path toPath:ob_add_2 error:&new_error]

//文件删除   也要注意有文件名和后缀“xxx.xx”

先判断有无文件

[new_File fileExistsAtPath:ob_add_2]

删除

[new_File removeItemAtPath:ob_add_2 error:&new_error]

==========================================================================

//写入

/设置为写入模式

NSFileHandle *new_handle = [NSFileHandle fileHandleForWritingAtPath:path];

/先转码

NSString *new_string = @"hello,hello,hello,世界";

NSData *new_data = [new_string dataUsingEncoding:NSUTF8StringEncoding];

/再写入

[new_handle writeData:new_data];

//追加

/先找到最后的

[new_handle seekToEndOfFile];

/写入转码后的数据

[new_handle writeData:new_data_2];

//覆盖

/先找到偏移位

[new_handle seekToFileOffset:3];

/写入转码后的数据

[new_handle writeData:new_data_3];

//关闭操作

[new_handle closeFile];

//读取

/设置为读取模式

new_handle = [NSFileHandle fileHandleForReadingAtPath:path];

/读取所有data

NSData *read_data = [new_handle readDataToEndOfFile];

/转成字符串

NSString *read_string = [[NSString alloc]initWithData:read_data encoding:NSUTF8StringEncoding];

/设置为读取模式，否则有问题

new_handle = [NSFileHandle fileHandleForReadingAtPath:path];

/读取前几个数据

read_data = [new_handle readDataOfLength:10];

/转成字符串

ead_string = [[NSString alloc]initWithData:read_data encoding:NSUTF8StringEncoding];

//关闭操作

[new_handle closeFile];

5、

协议

@required

@optional

nonatomic

copy assign

==================================================

.h签协议

<NSCopying>

.m设置要复制的值

- (id)copyWithZone:(nullable NSZone *)zone

{

NSLog(@"复制对象调用了！");

Person *person = [[self class] allocWithZone:zone];

person.name = [_name mutableCopy];

person.age = _age;

person.bookArray = [_bookArray mutableCopy];

return person;

}

调用

Person *person2 = [person1 copy];

==================================================

.h签协议

<NSCoding>

.m设置要复制的值

- (void)encodeWithCoder:(NSCoder *)aCoder

{

[aCoder encodeObject:_name forKey:NAME];

[aCoder encodeInteger:_age forKey:AGE];

[aCoder encodeObject:_hobby forKey:HOBBY];

}

- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder

{

self = [super init];

if (self)

{

self.name = [aDecoder decodeObjectForKey:NAME];

self.age = [aDecoder decodeIntegerForKey:AGE];

self.hobby = [aDecoder decodeObjectForKey:HOBBY];

}

return self;

}

调用

//地址

NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/di8zhangzuoue.txt"];

//归档

[NSKeyedArchiver archiveRootObject:atext toFile:path]

//读取

[NSKeyedUnarchiver unarchiveObjectWithFile:path];

==================================================

单例 共享信息

.m

static OneT *newone = nil;

+(instancetype)shalldata

{

if (newone == nil)

{

newone = [[OneT alloc]init];

newone.data_zone = [NSMutableArray array];

}

return newone;

}

调用：

OneT *one = [OneT shalldata];

OneT *two = [OneT shalldata];

==================================================

NSArray *data = [NSArray arrayWithObjects:@"zhang3",@"li4", nil];

NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"ceshi83.txt"];

BOOL status = [NSKeyedArchiver archiveRootObject:data toFile:path];

NSLog(@"%@",status?@"成功":@"失败");

NSArray *r_data = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

NSLog(@"%@",r_data);

6、

instancetype:返回与初始化类相同的类型。

-（instancetype)initWith…

{

self=[super init];

if(self)

{

…

}

return self;

}

-（class_A *）initwithone:(int)a other:(int)b

{

self=[super init];

if(self)

{

[self seta:a b:b ] ;

}

return self;

}

+(instancetype)robotWithName:(NSString*)r_name andage:(int)r_age

{

#if 0

return [[self alloc]initWithName:(NSString*)r_name andage:(int)r_age];

#else

Robot *new_R = [[Robot alloc]initWithName:r_name andage:r_age];

return new_R;

#endif

}

@private 私有：只有类定义内部可访问

@protected 保护：只有类本身和子类的定义里可访问

@public 公有：程序的任何位置都可访问

/** xxx */

#progame MARK xxx

[self performSelector:@selector(delaylog:) withObject:@"3秒" afterDelay:2];

[[NSRunLoop currentRunLoop]run];

7、

SET

//初始化

NSSet *set = [[NSSet alloc]initWithObjects:@“_1”,@“_2”,@“_3”,@“_4”,@“_3”, nil];

//可变初始化

NSMutableSet *mSet = [NSMutableSet set];

//可变添加对象

[mSet addObject:numobject];

//建个数组

NSArray *array = [NSArray arrayWithObjects:@“_3”,@“_4”,@“_5”, nil];

//取数组的对象初始化

NSSet *newSet = [NSSet setWithArray:array];

//又把set的对象给数组，自动消除重复

NSArray *newArray = [newSet allObjects];

//打印

NSLog(@"%ld",[newSet count]);

//任意取！ 但不保证随机！

NSLog(@"%@",[set anyObject]);

//是否等价

[set isEqualToSet:newSet]

//是否包含

[newSet isSubsetOfSet:set]

ENUM

//将set的值给枚举

NSEnumerator *enumtor = [set objectEnumerator];

//将枚举里的对象一一打印

for (NSObject* obj in enumtor)

{

NSLog(@"-->%@",obj);

}

8、

日期时间

//美国的时间

NSDate *date = [[NSDate alloc]init];

//时区

NSTimeZone *myZone = [NSTimeZone systemTimeZone];

//算时差 加上时差

NSInteger interValTimer = [myZone secondsFromGMTForDate:date];

NSDate *localDate = [date dateByAddingTimeInterval:interValTimer];

NSLog(@"%@",localDate);

//明天

NSDate *date2 = [NSDate dateWithTimeIntervalSinceNow:24*60*60];

//昨天

NSDate *date2 = [NSDate dateWithTimeIntervalSinceNow:-ADAY];

NSLog(@"date2 = %@",date2);

//1970年

NSDate *date2 = [NSDate dateWithTimeIntervalSince1970:0];

NSLog(@"%@",date2);

//参考日期2001年

NSDate *date3 = [NSDate dateWithTimeIntervalSinceReferenceDate:0];

NSLog(@"%@",date3);

//nsdate -> nsstring 类型转换

NSDate *date1 = [NSDate date];

1.

NSString *date1str = date1.description; //美国的时间

2

NSDateFormatter *dateFormat1 = [[NSDateFormatter alloc]init];

2.1

[dateFormat1 setDateFormat:@"yyyy年MM月dd日 EEEE HH mm ss zz"];

2.2

[dateFormat1 setDateStyle:NSDateFormatterShortStyle];

[dateFormat1 setTimeStyle:NSDateFormatterMediumStyle];

NSString *datestr2 = [dateFormat1 stringFromDate:date1];

NSLog(@"datestr2 = %@",datestr2);

//获取所有时区的名字

NSArray *timeZoneNames =  [NSTimeZone knownTimeZoneNames];

//新建一个时区

NSTimeZone *newZone = [NSTimeZone timeZoneWithName:@"Pacific/Fiji"];

//新建一个时间格式

NSDateFormatter *dateFormat2 = [[NSDateFormatter alloc]init];

//设置该时区

[dateFormat2 setTimeZone:newZone];

//设置时间格式

[dateFormat2 setDateFormat:@"yyyy年MM月dd日 EEEE HH:mm:ss zz"];

//打印

NSString *dateString =  [dateFormat2 stringFromDate:[NSDate date]];

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

//字符串转date

NSString *dateStr4 = @"2016年07月27日 星期三 20:16:10 GMT+12";

NSDate *date4 = [dateFormat2 dateFromString:dateStr4];

NSLog(@"%@",date4);

NSRange newrange = NSMakeRange(1,5);

NSValue *newvalue = [NSValue valueWithRange:newrange];

NSLog(@"%@",newvalue);

NSArray *newarray = [NSArray arrayWithObjects:newvalue, nil];

NSLog(@"%@",newarray);

NSRange newrange2 = [newvalue rangeValue];

NSLog(@"%lu,%lu",newrange2.location,newrange2.length);

//封装自定义的结构体

struct MyPoint

{

int x;

int y;

};

struct MyPoint mypoint;

mypoint.x = 10;

mypoint.y = 100;

NSValue *val2 = [NSValue value:&mypoint withObjCType:@encode(struct MyPoint)];

NSLog(@"%@",val2);

struct MyPoint mypoint2;

[val2 getValue:&mypoint2];

NSLog(@"mypoint2.x = %d,mypoint2.y = %d",mypoint2.x,mypoint2.y);

9、

@interface class_A:NSObject

…

@end

@implementation class_A

…

@end

@property int x;

@synthesize x;

[MyA setNumb:5]; 即使实例变量是小写，这个set后也要大写

n=[MyA numb];

[A B]  等价 A.B

[self 该.m文件的方法]，找不到再去父类找

与文件.h.m同名

@interface class_A:NSObject

…

@end

@interface class_B:class_A

…

@ens

继承里，class_B里的方法的可以用

[self A的方法]

[self A的变量]

需要某文件的某些方法，可以用

@class xxx.h

小

如果xxx.h的某些方法访问不了，如init,还是要

#import xxx.h

大

重复包含的，其中一个.h可以用@class xxx（不用写.h），对应.m要#import xxx.h

同名方法优先使用class_B的方法

同名的方法，会自动判断[A set_value:(int)x]的类，如判断出A

id x；

x=任意变量、class类

@try

{

…

}

@catch

{

…

}

@finally

{

…

}

还有的@throw

10、

字符串：

字符串的创建

对象方法：

[[NSString alloc]init];

[[NSString alloc]initWithString:string];

[[NSString alloc]initWithFormat:@"%@",string1];

类方法：

[NSString stringWithString:string];

[NSString stringWithFormat:@"%@",string2];

字符串格式化拼接

[NSString stringWithFormat:@"%@%@",string3,string4];

字符串比较

[string3 isEqualToString:string4];

[string3 caseInsensitiveCompare:string4];

[string3 compare:string4]

字符串长度

[string length];

string.length;

字符串大小写变化

[string uppercaseString];

[string lowercaseString];

[string capitalizedString];

字符串追加

[string4 stringByAppendingString:string3];

字符串查找

[string rangeOfString:@"world"];

NSNotFound

[string hasPrefix:@“www”];

[string hasSuffix:@“com”];

字符串截取

[string substringFromIndex:2];

[string substringToIndex:5];

[string substringWithRange:range];

字符串跟基本数据类型转换

[NSString stringWithFormat:@"%d",a];

[NSString stringWithFormat:@"%f",b];

[NSString stringWithFormat:@"%c",c];

[strnum1 intValue];

[strnum2 floatValue];

const char *cc = [strchar UTF8String];

字符串取个元素

[newstring characterAtIndex:3]

字符串是否包含

[mString containsString:@"hello"];

可变字符串的创建

[[NSMutableString alloc]initWithString:string];

[[NSMutableString alloc]initWithFormat:@"%@",string];

[NSMutableString stringWithString:string];

[NSMutableString stringWithFormat:@"%@",string];

可变字符串的替换

[mString replaceCharactersInRange:NSMakeRange(2,2) withString:@"xxx"];

可变字符串的插入

[mString insertString:@"aaa" atIndex:1];

可变字符串的删除

[mString deleteCharactersInRange:NSMakeRange(1, 3)];

可变字符串的追加

[S_1 appendString:@"QAZ"];

[S_1 appendFormat:@"%@",S_1];

11、

字典的创建

NSDictionary *dic = [[NSDictionary alloc]init];

//dic = @{key:value,...};

dic = @{

@"name":@"xiaoming",

@"age":@"18",

@"sex":@"男",

@"name1":@"xiaoming"

};

对象方法：

//dic2 = @{value:key,...};

NSDictionary *dic2 = [[NSDictionary alloc]initWithObjectsAndKeys:@"xiaohong",@"name",@"20",@"age",@"男",@"sex",@"12",@"20",@"aaa",@"bbb", nil];

NSDictionary *dic3 = [[NSDictionary alloc]initWithDictionary:dic2];

类方法：

NSDictionary *dic4 = [NSDictionary dictionaryWithDictionary:dic3];

字典的长度

字典根据key获取value

[dic objectForKey:@"age"]

dic[@"age"]

字典取出所有的key

NSArray *keyArray = [dic allKeys];

字典取出所有的value

NSArray *valueArray = [dic allValues];

可变字典的创建

NSMutableDictionary *mDic1 = [NSMutableDictionary dictionary];

类方法：

NSMutableDictionary *mDic = [[NSMutableDictionary alloc]initWithObjectsAndKeys:@"xiaoming",@"name",@"19",@"age",@"男",@"sex", nil];

可变字典添加元素

[mDic setObject:@"80kg" forKey:@"weight"];

可变字典删除元素

[mDic removeObjectForKey:@"age"];

[mDic removeObjectsForKeys:array];

可变字典删除所有元素

[mDic removeAllObjects];

可变字典遍历

for (NSString *key in mDic)

{

NSLog(@"%@",mDic[key]);

}

存储

NSString *path = @"/Users/etcxm/test.plist";

[dic writeToFile:path atomically:YES];

NSArray  *A_data_R = [NSArray array];

A_data_R = [NSArray arrayWithContentsOfFile:S_add];

12、

数组的创建

NSArray *array1 = [[NSArray alloc]init];

array1 = @[@"here",@"is",@"etcxm"];

对象方法：

NSArray *array6 = [[NSArray alloc]initWithObjects:array1,array5, nil];

NSArray *array2 = [[NSArray alloc]initWithObjects:@"here",@"is",@"china", nil];

NSArray *array3 = [[NSArray alloc]initWithArray:array1];

类方法：

NSArray *array4 = [NSArray arrayWithObject:@"hello"];

NSArray *array5 = [NSArray arrayWithObjects:@"here",@"is",@"china", nil];

NSArray *array6 = [NSArray arrayWithArray:array1];

数组取下标元素

array5[2]；

[array5 objectAtIndex:2]；

数组的长度

array5.count

[array5 count]

数组是否包含某个元素

[array10 containsObject:@"hello”];

数组通过元素获取下标

[array10 indexOfObject:@"1123”];

NSNotFound

数组连接成字符串，字符串分割成数组

NSString *string = [array1 componentsJoinedByString:@" "];

NSArray *array2 = [string componentsSeparatedByString:@"i"];

数组访问最后一个元素

[array1 lastObject];

[array1 firstObject];

数组遍历

for (NSString *str in array1)

{

NSLog(@"->%@",str);

}

数组追加元素

NSArray *array3 = [array1 arrayByAddingObject:@"hello"];

NSArray *array4 = [array1 arrayByAddingObject:array3];

NSArray *array5 = [array1 arrayByAddingObjectsFromArray:array3];

可变数组的创建

NSMutableArray *mArray = [[NSMutableArray alloc]initWithObjects:@"hello",@"world",@"china", nil];

可变数组添加元素

[mArray addObject:@"American"];

NSArray *array = [[NSArray alloc]initWithObjects:@"hi",@"hei", nil];

[mArray addObjectsFromArray:array];

可变数组删除元素

[mArray removeAllObjects];

[mArray3 removeObject:@"here"];

[mArray3 removeObjectAtIndex:3];

[mArray3 removeLastObject];

[mArray3 removeObjectsInArray:arraytest];

[mArray3 removeObjectsAtIndexes:set1];

[mArray3 removeObject:@"here" inRange:NSMakeRange(0, 3)];

[mArray3 removeObjectsInRange:NSMakeRange(1, 4)];

可变数组交换位置

[mArray3 exchangeObjectAtIndex:0 withObjectAtIndex:3];

可变数组替换

[mArray3 replaceObjectAtIndex:0 withObject:@"objxxx"];

可变数组插入

[mArray3 insertObject:@"iiiii" atIndex:1];

可变数组遍历

int i=0;

for (NSString *str in mArray)

{

NSLog(@"%@",str);

NSLog(@"%d",i++);

}