IOS開發之NSString的使用大全

*  nsstring               //不可變的字串

*  nsmutablestring   //可變的字串

char *s = "hello objective-c";  //c

nsstring *str = @"hello";  //oc
//oc,c字串型別轉換c->oc
nsstring *str1 = [nsstring stringwithutf8string:s]
nslog(@"str1 = %@",str1);
//oc->c
nslog(@"str2 = %s",[str utf8string]);

nsstring *str3 = @"ios"

//建立字串
nsstring *str4 = [[nsstring alloc] init];
str4 = @"ios";
//*格式化字串*
int a = 10;
int b = 20;
nsstring *str5 = [nsstring stringwithformat:@"a=%d b=%d",a,b];
nslog(@"str5 = %@",str5);

nslog(@"str6 =%@",str6);

大小寫轉換 :

nsstring *str7 = @"abcdef"

nsstring *str8 = [str7 lowercasestring];
nslog(@"str8 = %@",str8);
//轉換大寫
nsstring *str9 = [str7 uppercasestring];
nslog(@"str9 = %@",str9 );

nsstring *str10 = @"www.csdn.com";

bool hasprefix = [str10 hasprefix:@"www."];
if(hasprefix)
nslog(@"有對應字首");
else
nslog(@"沒有對應字首");
bool hassuffix = [str10 hassuffix:@".com"];
if(hassuffix)
nslog(@"有對應字尾");
else
nslog(@"沒有對應字尾");

nsstring *str11 = @"hello"

nsstring *str12 = @"hello"
if([str11 isequaltostring:str12])
nslog(@"兩個字串一致");
else
nslog(@"兩個字串不一致");

nsstring *str13 = @"a,b,c,d,e,f,g";

nsarray *strarray = [str13 componentsseparatedbystring:
@","];
for(nsstring *str in strarray)

nsrange range = nsmakerange(1,5);

nsstring *str14 = [str13 substringwithrange:range];
nslog(@"str14 = %@",str14);

nsstring *str15 = [str13 substringfromindex:2];

nslog(@"str15 = %@",str15);

nsstring *str16 =[str13 substringtoindex:7];

for(int i=0;i<[str13 length];i++)

nsstring *str17 = @"ab cd ef gh ij ab";

//查詢指定字串的位置
nsrange range1 = [str17 rangeofstring:@"ab"];
nslog(@"range1.location:%ld range1.length:%ld",range1.
location,range1.length);

nsstring *str18 = @"hello ios,hello csdn";

//替換某乙個範圍內容
nsstring *str19 = [str18 stringbyreplacingcharactersinrange:nsmakerange(0,5)
withstring:@"你好"];

stringbyreplacingoccurrencesofstring:-原字串中要被替換的內容 withstring:－替換的字串:

nsstring *str20 = [str18 stringbyreplacingoccurrencesofstring:@"hello"

withstring:@"你好"];

nsstring *str21 = @"www.baidu.com";

//網路路徑
//本地路徑  
nsstring *fileurl = [nsurl fileurlwithpath:str21];
//讀取網路檔案
//讀取本地檔案
nsstring *filestr = [nsstring stringwithcontentsoffile:@"/users/quzhiyu/desktop/test.txt" encoding:nsutf8stringencoding error:nil];
//寫入檔案
nsstring *str22 = @"hello csdn";
bool isok = str22 writetofile:@"/users/quzhiyu/desktop/test.txt"    atomically:yes encoding:nsutf8stringencoding error:nil];

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