Common usage of API nsstring __API

/*

Length

NSString *string = [[NSString alloc]

initwithformat:@ "SDGIJKHAJKHKHKLHDSHJGDST"];

NSLog (@ "%lu", [string length]);

-(Unichar) Characteratindex:

(Nsuinteger) index; Output a character at a specified position in a subscript

NSString *s = [[NSString

alloc]initwithformat:@ "Abckjghj"];

NSLog (@ "%c", [s characteratindex:2]);

-(NSString *) Substringfromindex:

(Nsuinteger) from; Output all strings from the ⾯ surface after the index subscript starts

NSLog (@ "%@", [string substringfromindex:4]);

-(NSString *) Substringtoindex:

(Nsuinteger) to; ⼀ one output from the start position of the string to the index subscript position

NSLog (@ "%@", [string substringtoindex:5]);

-(NSString *) Substringwithrange:

(nsrange) range; The string within the range of the output range

NSLog (@ "%@", [String Substringwithrange:nsmakerange (2, 5)]);

-(Nscomparisonresult) Compare: (nsstring*) string; ⽐ comparison between posterior ⾯ surface and anterior ⾯ physiognomy

if ([string compare:s] = = 1) {

NSLog (@ "ascending");

else if ([string compare:s] = = 1) {

NSLog (@ "descending");

} else {

NSLog (@ "equal");

}

-(Nscomparisonresult) Caseinsensitivecompare:

(NSString *) string; Case-insensitive comparisons

if ([string caseinsensitivecompare:s]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(Nscomparisonresult) Localizedcompare:

(NSString *) string; Local comparison

if ([s localizedcompare:string]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

// -

(Nscomparisonresult) Localizedcaseinsensitivecompare: (NSString *) string; Case-insensitive comparison of whether a previous string contains the latter string

if ([string

Localizedcaseinsensitivecontainsstring:s]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(Nscomparisonresult) Localizedstandardcompare: (NSString *) Comparison of string//Standard

if ([string localizedstandardcompare:s]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(BOOL) isequaltostring: (nsstring*) astring; To determine whether two strings are equal

if ([string isequalto:s]) {

NSLog (@ "1");

} else {

NSLog (@ "0");

}

-(BOOL) Hasprefix: (NSString *) astring; Prefix

if ([String hasprefix:@ "SD"]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(BOOL) Hassuffix: (NSString *) astring; Suffix

if ([String hassuffix:@ "DST"]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

*/

/*

-(BOOL) containsstring: (NSString *) astring//whether contains strings

if ([String containsstring:@ "a"]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(BOOL) Localizedcaseinsensitivecontainsstring:

(NSString *) astring//case-insensitive whether or not to contain strings

if ([String containsstring:@ "D"]) {

NSLog (@ "yes");

} else {

NSLog (@ "no");

}

-(Nsrange) rangeofstring: (nsstring

*) astring; The coordinates of the output string

Nsrange r1 = [string rangeofstring:@ "a"];

NSLog (@ "{%lu,%lu}", R1.location, R1.length);

-(Nsrange) Rangeofcharacterfromset:

(Nscharacterset *) aset;

Nsrange R3 = [string

Rangeofcomposedcharactersequenceatindex:3];

NSLog (@ "{%lu,%lu}", R3.location, R3.length);

-(NSString *) stringbyappendingstring: (nsstring*) astring; Stitching strings

-(NSString *) Stringbyappendingformat: (nsstring*) format, ...//format stitching string

NSLog (@ "%@", string);

*/

-(Nsarray *) componentsseparatedbystring: (NSString *) separator;

Nsarray *array= [[Nsarray alloc]

initwithobjects:@ "123", @ "SDF", @ "456", @ "DFG", nil];

[Array componentsjoinedbystring:@ "S"];

NSLog (@ "%@", array);

//

NSLog (@ "%@", [string uppercasestring]); Uppercase output

NSLog (@ "%@", [string lowercasestring]); lowercase output

NSLog (@ "%@", [string capitalizedstring]); Capitalize first letter

//

NSString * str = [[NSString alloc]

initwithformat:@ "Qwerrtyyu"];

NSLog (@ "%@", [str description]);

// */

/*

@property (readonly) Nsuinteger hash; Converts letters to the corresponding hash value

NSLog (@ "%lu", [@ "F" hash]);

*/

Search criteria

/*

enum{

Nscaseinsensitivesearch = 1,//case-insensitive comparison

Nsliteralsearch = 2,//Case Sensitive comparison

Nsbackwardssearch = 4,//Starting at end of string

Nsanchoredsearch = 8,//A string of search limit ranges

Nsnumbericsearch = 64//The order according to the numbers in the string. For example Foo2.txt < Foo7.txt < Foo25.txt

The following definitions are higher than the Mac OS 10.5 or ⾼ above the iphone 2.0 available

Nsdiacriticinsensitivesearch = 128,//ignores the comparison of "-" symbols

Nswidthinsensitivesearch = 256,//ignores the ⻓ length of the string, comparing the results

Nsforcedorderingsearch = 512//ignores options for case-insensitive comparisons and forces return nsorderedascending or nsordereddescending

The following definitions ⾼ above the iphone 3.2 can be ⽤

Nsregularexpressionsearch = 1024//can only be applied to

Rangeofstring:..,

Stringbyreplacingoccurrencesofstring: ... and replaceoccurrencesofstring: ... Method. Using a universally compatible comparison method, if you set this item, you can remove Nscaseinsensitivesearch and

Nsanchoredsearch

}*/

/*

Variable string

nsmutablestring *mstring = [[Nsmutablestring alloc] initwithformat:@ "Master and apprentice four people and Demons"];

[Mstring insertstring:@ "Western Heaven to Learn" atindex:4];

NSLog (@ "%@", mstring);

[Mstring Deletecharactersinrange:nsmakerange (4,4)];

NSLog (@ "%@", mstring);

[Mstring appendformat:@ "Between heaven and Earth"];

NSLog (@ "%@", mstring);

[Mstring appendstring:@ "No one can Tube"];

NSLog (@ "%@", mstring);

-(Nsmutablestring *) Initwithcapacity:

(Nsuinteger) capacity;

Initialization with capacity

+ (nsmutablestring *) Stringwithcapacity:

(Nsuinteger) capacity;

Convenience Builder with capacity

[Mstring replaceoccurrencesofstring:@ "Between Heaven and Earth"

withstring:@ "from east to west to the Holy Land"

Options:nsbackwardssearch Range:nsmakerange (8, 8)];

NSLog (@ "%@", mstring);

Estimate how much space you want to apply, equivalent to a unit

Nsmutablestring *string2 =

[[Nsmutablestring alloc] initwithcapacity:10];

[string2 appendstring:@ "haha"];

NSLog (@ "%@", string2);

//

nsmutablestring * String3 =

[[Nsmutablestring Alloc]

initwithformat:@ "XXXXXXX.PCG"];

if ([String3 hassuffix:@ "PNG"]) {

Nsrange range = [string3

rangeofstring:@ "PNG"];

[String3 Replacecharactersinrange:range

withstring:@ "JPG"];

} else {

[String3 appendstring:@ "jpg"];

// }

NSLog (@ "%@", string3);

*/