O-c study July record nsstring usage

1 Creating strings

NSString *str1 = @ "Hello";

NSString *str2 = [NSString string];

NSString *STR3 = [NSString stringwithformat:@ "Hello,%@", @ "Lin Lin"];

NSString *STR4 = [NSString stringwithcstring: "hello,mingming" encoding:nsutf8stringencoding];

NSString *STR5 = [NSString stringwithutf8string: "Hello,mingming"];

NSString *STR6 = [NSString stringwithcontentsoffile:@ "/USERS/QINGYUN/DESKTOP/TEST.M" encoding:NSUTF8StringEncoding Error:nil];//stringwithconentsoffile:encoding:error:

NSLog (@ "str1 >>>%@", str1);

NSLog (@ "str2 >>>%@", str2);

NSLog (@ "Str3 >>>%@", STR3);

NSLog (@ "STR4 >>>%@", STR4);

NSLog (@ "STR5 >>>%@", STR5);

NSLog (@ "STR6 >>>%@", STR6);

2 length

NSLog (@ "str6 ' length >>>>%ld", [STR6 length]);

3 String Comparisons

NSString *STR7 = @ "hello000";

NSString *str8 = [NSString STRINGWITHSTRING:STR7];

NSString *STR9 = [NSString stringwithformat:@ "he%@", @ "llo00000"];

NSLog (@ "STR7 >>>>>%p", STR7);

NSLog (@ "Str8 >>>>>%p", str8);

NSLog (@ "STR9 >>>>>%p", STR9);

STR7 and STR9 are two pointers, so use = = to compare values directly

if (STR7 = = STR9) {

NSLog (@ "equal");

} else {

NSLog (@ "unequal");

}

Compare String Contents

if ([Str7 ISEQUALTOSTRING:STR9]) {

NSLog (@ "equal");

} else {

NSLog (@ "unequal");

}

NSString *str10 = @ "100000";

NSString *str11 = @ "000100000";

Nscomparisonresult result = [Str10 compare:str11 options:nsnumericsearch];

NSLog (@ "result >>>%ld", result);

NSString *str12 = @ "410324198510282811";

NSString *str13 = @ "19851028";

Nscomparisonresult RESULT1 = [Str12 compare:str13 options:nscaseinsensitivesearch Range:nsmakerange (6,8)]; Options Range Category

NSLog (@ "Result1 >>>%ld", RESULT1);

4. Connection character Chuan

NSString *str14 = @ "Hello";

NSString *str15 = [Str14 stringbyappendingstring:@ "Weiliang"];//append Append, add

NSString *str16 = [@ "/users/qingyun" stringbyappendingpathcomponent:@ "Desktop"];//component components, components, elements

NSLog (@ "Str15 >>>>>%@", str15);

NSLog (@ "str16 >>>>>%@", str16);

5. String Lookup

NSString *str17 = @ "Today we learn GCD";

if ([Str17 containsstring:@ "GCD"]) {

NSLog (@ "Teenager, study hard, don't care about things you shouldn't care about.");

}//contains contains, accommodates

NSString *str18 = @ "410000xxxxxxxxxx";

if ([Str18 hasprefix:@ "41"]) {

NSLog (@ "Henan people");

}//Hasprefix: The function of a method is to determine whether the created string content starts with a prefix

NSString *str19 = @ "Icon.exe";

if ([Str19 hassuffix:@ "png"] | | [Str19 hassuffix:@ "jpg"]) {

NSLog (@ "legal Avatar");

}//hassuffix: The function of the method is to determine whether the created string content starts with a suffix

NSString *str20 = @ "~/desktop/test.h";

NSLog (@ "pathextension >>>%@", [Str20 pathextension]);//File extension Extension expand, expand

NSLog (@ "absolute path >>>%@", [Str20 Stringbyexpandingtildeinpath]); Expand Expand Tilde Wave number

NSLog (@ "absolute path >>>%@", [[Str20 Stringbyexpandingtildeinpath] stringbyabbreviatingwithtildeinpath]); Close-Up Wave number abbreviate abbreviated shortening

6 Extracting substrings

NSString *str21 = @ "Hello, Yangxu";

NSLog (@ "subString >>>%@", [Str21 substringfromindex:6]);//sub root is ' son ' intercept from sixth character

NSLog (@ "subString >>>%@", [Str21 substringtoindex:6]); Intercept Six characters

NSLog (@ "subString >>>%@", [Str21 Substringwithrange:nsmakerange (3, 5)]); Word definition intercept Range

/********* variable String *********/

nsmutablestring *mstr = [nsmutablestring stringwithcapacity:50];//capacity capacity

nsmutablestring *mstr = [nsmutablestring stringwithstring:@ "1506"];

nsmutablestring *mstr = [nsmutablestring stringwithformat:@ "1506-%@-", @ "master"];

1 Append

[Mstr appendstring:@ "Zhang"];

NSLog (@ "MSTR >>>%@", MSTR);

[Mstr appendstring:@ "Qinpei"];

NSLog (@ "MSTR >>>%@", MSTR);

2. Delete

[Mstr deletecharactersinrange:nsmakerange (0, 4)];

NSLog (@ "MSTR >>>%@", MSTR);

3. Insert

[Mstr insertstring:@ "1506" atindex:0];

NSLog (@ "MSTR >>>%@", MSTR);

4. Replace

[Mstr Replacecharactersinrange:nsmakerange (5, 4) withstring:@ "Teacher"];//replaces 4 characters with teacher starting with the fifth character

NSLog (@ "MSTR >>>%@", MSTR);

5. Formatting append

[Mstr appendformat:@ "-%@", @ "Stage1"];

NSLog (@ "MSTR >>>%@", MSTR);

2015-07-18 10:14:17.013 testnsstring[3033:385566] str1 >>> Hello

2015-07-18 10:14:17.014 testnsstring[3033:385566] str2 >>>

2015-07-18 10:14:17.014 testnsstring[3033:385566] str3 >>> Hello, Lin Lin

2015-07-18 10:14:17.014 testnsstring[3033:385566] STR4 >>> hello,mingming

2015-07-18 10:14:17.014 testnsstring[3033:385566] STR5 >>> hello,mingming

2015-07-18 10:14:17.014 testnsstring[3033:385566] STR6 >>> (NULL)

2015-07-18 10:14:17.014 testnsstring[3033:385566] str6 ' length >>>> 0

2015-07-18 10:14:17.014 testnsstring[3033:385566] STR7 >>>>> 0x1000021b0

2015-07-18 10:14:17.014 testnsstring[3033:385566] str8 >>>>> 0x1000021b0

2015-07-18 10:14:17.015 testnsstring[3033:385566] STR9 >>>>> 0x100300210

2015-07-18 10:14:17.015 testnsstring[3033:385566] Not Equal

2015-07-18 10:14:17.015 testnsstring[3033:385566] Not Equal

2015-07-18 10:14:17.015 testnsstring[3033:385566] RESULT1 >>> 0

2015-07-18 10:14:17.015 testnsstring[3033:385566] str15 >>>>> Helloweiliang

2015-07-18 10:14:17.015 testnsstring[3033:385566] str16 >>>>>/users/qingyun/desktop

2015-07-18 10:14:17.015 testnsstring[3033:385566] Boy, study hard, don't care about things you shouldn't care about. ..

2015-07-18 10:14:17.015 testnsstring[3033:385566] it's Henan.

2015-07-18 10:14:17.025 testnsstring[3033:385566] pathextension >>> H

2015-07-18 10:14:17.026 testnsstring[3033:385566] absolute path >>>/users/qingyun/desktop/test.h

2015-07-18 10:14:17.026 testnsstring[3033:385566] absolute path >>> ~/desktop/test.h

2015-07-18 10:14:17.026 testnsstring[3033:385566] subString >>> Yangxu

2015-07-18 10:14:17.026 testnsstring[3033:385566] subString >>> Hello,

2015-07-18 10:14:17.026 testnsstring[3033:385566] subString >>> lo, y

2015-07-18 10:14:17.026 testnsstring[3033:385566] MSTR >>> 1506-master-zhang

2015-07-18 10:14:17.026 testnsstring[3033:385566] MSTR >>> 1506-master-zhangqinpei

2015-07-18 10:14:17.026 testnsstring[3033:385566] MSTR >>>-master-zhangqinpei

2015-07-18 10:14:17.027 testnsstring[3033:385566] MSTR >>> 1506-master-zhangqinpei

2015-07-18 10:14:17.027 testnsstring[3033:385566] MSTR >>> 1506-teacherer-zhangqinpei

2015-07-18 10:14:17.027 testnsstring[3033:385566] MSTR >>> 1506-teacherer-zhangqinpei-stage1

O-c study July record nsstring usage