字符串处理

NSString *first = @"abdcbabcdbabcbacbcb";

002	NSString *second = @"cdcdcdcd";

003	NSString *third = @"string1:string2:string3:string4";

004	NSArray *strings = [NSArray arrayWithObjects:first, second, third, nil];

005

006	//  将字符串数组连接起来

007	NSString *string1 = [strings componentsJoinedByString:@"@"];

008	NSLog(@"%@", string1);

009

/*

010	abdcbabcdbabcbacbcb@cdcdcdcd@string1:string2:string3:string4

011

*/

012	NSString *string2 = [strings componentsJoinedByString:@""];

013	NSLog(@"%@", string2);

014

/*

015	abdcbabcdbabcbacbcbcdcdcdcdstring1:string2:string3:string4

016

*/

017

018

019	//  将字符串根据特定字符分割成字符串数组

020	NSArray *chunks1 = [string1 componentsSeparatedByString:@"@"];

021	NSLog(@"%@", chunks1);

022

/*

023

(

024	abdcbabcdbabcbacbcb,

025

cdcdcdcd,

026	"string1:string2:string3:string4"

027

)

028

*/

029	NSCharacterSet *charSet = [NSCharacterSet characterSetWithCharactersInString:@"bc"];

030	NSArray *chunks2 = [first componentsSeparatedByCharactersInSet:charSet];

031	NSLog(@"%@", chunks2);

032

/*

033

(

034

a,

035

d,

036

"",

037

a,

038

"",

039

d,

040

a,

041

"",

042

"",

043

a,

044

"",

045

"",

046

"",

047

""

048

)

049

*/

050

051	//  字符串替换(NSMutableString)

052	NSMutableString *mstring = [NSMutableString stringWithString:third];

053	NSRange range = NSMakeRange(0, 5);

054	[mstring replaceOccurrencesOfString:@"s" withString:@"A" options:NSLiteralSearch range:NSMakeRange(0, third.length)];

055	NSLog(@"%@", mstring);

056

/*

057	Atring1:Atring2:Atring3:Atring4

058

*/

059

060	[mstring replaceCharactersInRange:range withString:@"BBBBBBBBBBBBBBB"];

061	NSLog(@"%@", mstring);

062

/*

063	BBBBBBBBBBBBBBBg1:Atring2:Atring3:Atring4

064

*/

065

066	//  获取子字符串

067	NSRange range2 = NSMakeRange(0, 4);

068	NSString *string3 = [mstring substringWithRange:range2];

069	NSLog(@"%@", string3);

070

/*

071

BBBB

072

*/

073	NSString *string4 = [mstring substringFromIndex:10];

074	NSLog(@"%@", string4);

075

/*

076	BBBBBg1:Atring2:Atring3:Atring4

077

*/

078	NSString *string5 = [mstring substringToIndex:5];

079	NSLog(@"%@", string5);

080

/*

081

BBBBB

082

*/

083

084	//  去掉字符串中的'\n' '\t' ' '

085	NSString *tn = @"\t \nha ha\n\t";

086	NSString *trimedStr1 = [tn stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

087	NSLog(@"%@", trimedStr1);

088

/*

089

090

ha ha

091

*/

092	NSString *trimedStr2 = [tn stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

093	NSLog(@"%@", trimedStr2);

094

/*

095

ha ha

096

*/

097

098	//  对于多行的字符串，可以按行处理该字符串

099	NSMutableArray *altitudes = [NSMutableArray array];

100	NSString *altitudeString = @"a\nb\nc\nd\n";

101	[altitudeString enumerateLinesUsingBlock: ^(NSString *line, BOOL *stop) {

102	[altitudes addObject: line];

103

}];

104	NSLog(@"%@", altitudes);