iOS開發之NSString的幾條實用技巧

常量字串

nsstring *string = @"i am an iosdevtip!";

nsstring *string = [[nsstring alloc] init];

string = @"i am an iosdevtip too!";

nsstring *string = [[nsstring alloc] initwithstring:@"iosdevtip is here!"];

int age = 20;

nsstring *personage = [nsstring stringwithformat:@"this person age is %d",age];

nsstring格式化字串

nsstring *name = @"iosdevtip";

nsstring *personname = [nsstring stringwithformat:@"this person name is %@",name];

//比較字串

nsstring *stingone = @"this is an iosdevtip!";
nsstring *stringtwo = @"this is an iosdevtip!";
bool result = [stingone isequaltostring:stringtwo];

bool result = [stingone compare:stringtwo] == nsorderedsame;

typedef ns_enum(nsinteger, nscomparisonresult) ;

nsstring *string = @"this is an iosdevtip!";

[string lowercasestring];

nsstring *string = @"this is an iosdevtip!";

[string uppercasestring];

nsstring *string = @"this is a operation string!";

nsstring *subtostring = [string substringtoindex:6];

substringfromindex擷取字串

nsstring *subfromstring = [string substringfromindex:6];

substringwithrange擷取字串

nsstring *rangestring = [string substringwithrange:nsmakerange(6, 3)];

rangeofstring判斷

nsstring *string1 = @"this is a iosdevtip";

nsstring *string2 = @"iosdevtip";
nsrange range = [string1 rangeofstring:string2];
nsinteger location = range.location;
nsinteger leight = range.length;
nsstring *logstring = [[nsstring alloc] initwithstring:[nsstring stringwithformat:@"location:%ld,leight:%ld",location,leight]];
nslog(@"logstring:%@",logstring);

iosstrongdemo[8837:2221170] logstring:location:10,leight:9

**：

//首字母大寫

nsstring *string = @"ligang";
nslog(@"string: %@",[string capitalizedstring]);

2015-07-16 23:06:11.652 iosstrongdemo[10279:3062010] string: ligang

//分割字串

nsstring *string = @"this is a iosdevtip";
nsarray *array = [string componentsseparatedbystring:@"a"];
nsstring *string1 = [array objectatindex:0];
nsstring *string2 = [array objectatindex:1];
nslog(@"string1:%@  string2:%@",string1,string2);

2015-07-16 22:40:39.559 iosstrongdemo[10165:3055448] string1:this is   string2: iosdevtip

//追加字串

nsmutablestring *string = [[nsmutablestring alloc] initwithstring:@"i love "];
nslog(@"string:%@",string);

2015-07-16 22:42:32.305 iosstrongdemo[10189:3056410] string:i love china

//插入字串

nsmutablestring *string = [[nsmutablestring alloc] initwithstring:@"i china"];
[string insertstring:@"love " atindex:2];
nslog(@"string: %@",string);

2015-07-16 22:44:10.706 iosstrongdemo[10206:3057014] string: i love china

//刪除字串

nsmutablestring *string = [[nsmutablestring alloc] initwithstring:@"i love china"];
[string deletecharactersinrange:nsmakerange(2, 4)];
nslog(@"string1: %@",string);

2015-07-16 22:46:58.437 iosstrongdemo[10219:3057749] string1: i  china

//判斷是否包含前字尾

nsstring *string = @"i love china";
bool ishasi = [string hasprefix:@"i"];
bool ishaschina = [string hassuffix:@"china"];

//替換字串

nsstring *string = @"i love china";
nsstring *replacestring = [string stringbyreplacingoccurrencesofstring:@"love" withstring:@"like"];
nslog(@"replacestring:  %@",replacestring);

2015-07-16 22:56:07.405 iosstrongdemo[10236:3059503] replacestring:  i like china

//去除字串首尾的空格和換行符

nsstring *string = @" i love china ";
nsstring *text = [string stringbytrimmingcharactersinset:[nscharacterset whitespaceandnewlinecharacterset]];
nslog(@"text:%@",text);

2015-07-16 23:00:47.845 iosstrongdemo[10265:3061013] text:i love china

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