IOS nssting about finding, intercepting, splitting, replacing, verifying, changing case, encoding and decoding of strings

1, find

Nsstring*str = @ "BFJFNNFKANFKNF";

Nsrange range = [str rangeofstring:@ "111"];

if (range.location = = Nsnotfound)

{

NSLog (@ "not found in STR 111");

}else {

NSLog (@ "Search range%@", Nsstringfromrange (range));

}

The following method is used later in the ios8.0 and is also judged to include a string

BOOL result = [@ "123" containsstring:@ "2"]; 2. Interception

NSSTRING*BSTR = [str substringwithrange:nsmakerange (loc,2)];

The LOC represents the beginning of the first few characters, 2 means intercepting two characters;

to intercept n characters starting from the first character: [str substringtoindex:n]; intercept from the first n+1 to the end of the string: [Str substringfromindex:n];
3, Split

Nsstring*string =@ "Facing the Sea/spring";

Nsarray*array = [string componentsseparatedbystring:@ '/'];//an array of 2 elements separated from characters/

NSLog (@ "array1 = =%@", [array firstobject]);

NSLog (@ "array2 = =%@", [array lastobject]); Print Result: Array1 = face toward the sea, Array2 = Spring 4. Replace

Nsstring*str =@ "12345678";

NSSTRING*REPLACEDSTR = [str stringbyreplacingoccurrencesofstring:@ "345" withstring:@ "string to be replaced"];

NSLog (@ "REPLACEDSTR = =%@", replacedstr);

Print results:

Replacedstr = = 12 you want to replace the string 678 5. Verify

NSSTRING*STR1 =@ "http:www.baidu.com";

BOOL a = [str1 hasprefix:@ "http"];//whether to start with HTTP

BOOL B = [str1 hassuffix:@ "com"];//file path ends with COM

NSLog (@ "A =====%d, b = =%d", a,b);

Print results:

A ===== 1, b = = 1 6. Turn into numbers

[Str boolvalue];

[Str IntegerValue]; 7. Change the case of a string

nsstring* str2 =@ "BeiJING";

Nsstring*da = [str2 uppercasestring];//converted to uppercase

Nsstring*xiao = [str2 lowercasestring];//to lowercase

Nsstring*shouda = [str2 capitalizedstring];//first letter uppercase, remaining lowercase

NSLog (@ "\ n Capital ==%@\n lowercase = =%@\n First letter uppercase Other lowercase = =%@", Da,xiao,shouda);

Print results:

Capital ==beijing

lowercase = = Beijing

First letter Uppercase Remaining lowercase = = Beijing 8. Encode, decode

Coding:

Nsstring*hstr =@ "Hello";

nsstring*hstring = [Hstr stringbyaddingpercentescapesusingencoding:nsutf8stringencoding];

NSLog (@ "hstring = =%@", hstring);

Decoding:

NSSTRING*STR3 =@ "\u5982\u4f55\u8054\u7cfb\u5ba2\u670d\u4eba\u5458\uff1f";

NSSTRING*STR5 = [str3stringbyreplacingpercentescapesusingencoding:nsutf8stringencoding];

NSLog (@ "string = =%@", STR5);

Print results:

hstring = =%e4%bd%a0%e5%a5%bd%e5%95%8a

String = = How to contact customer service personnel.