iOS network development toolset----string operations and time operations

Last Update:2016-03-11 Source: Internet

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first, How to manipulate the string<pre>#pragmaMark-create string-(void) creatstring{//<1> Create character creationNSString *strs =@"This is a string!"; //<2> Create an empty string, give the assignmentNSString *STRK =[[nsstring alloc] init]; STRK=@"This is a string!"; NSLog (@"strs:%@, strk%@", strs,strk); //<3> initializing strings with variablesNSString *name =@"Aofe"; NSString*STRN = [nsstring stringwithformat:@"My name is%@", name]; NSLog (@"strn:%@", strN);}#pragmaMark-determines If a string is included-(void) iscontainsstring{nsstring*STR1 =@"NSStringInformation.txt"; //<1> Checks if a string starts with another string[STR1 hasprefix:@"NSString"] ==1? NSLog (@"YES"): NSLog (@"NO"); //<2> Checks if the string ends with another string[STR1 hassuffix:@". txt"] ==1? NSLog (@"YES"): NSLog (@"NO"); //<3> Checks if a string contains other strings[STR1 rangeofstring:@"Information"].length >0? NSLog (@"YES"): NSLog (@"NO"); //<4> Checks if a string contains other strings[STR1 containsstring:@"ABC"]? NSLog (@"YES"): NSLog (@"NO");}#pragmaMark-read-write string-(void) writeandreadstring{//file pathNSString *path =@"wenjianquanlujing"; //<1> reading a string from a fileNSString *STRW =[nsstring Stringwithcontentsoffile:path encoding:nsutf8stringencoding error:null]; //<2> Writing a string to a file[strw writetofile:path atomically:yes encoding:nsutf8stringencoding error:null];}#pragmaMark-comparison of two strings-(void) comparertwostring{nsstring*STR1 =@"This is String1"; NSString*STR2 =@"This is String2"; //comparison of two strings for equalityBOOL RESULT1 =[STR1 isequaltostring:str2]; //comparison of two strings (the comparer method returns three values: nsorderedascending = -1l, nsorderedsame, Nsordereddescending)Nscomparisonresult result2=[STR1 compare:str2]; //do not consider the size comparison stringNscomparisonresult RESULT3 =[STR1 caseinsensitivecompare:str2]; NSLog (@"result1:%d,result2:%ld,result3:%ld", result1, (Long) result2, (Long) result3); }#pragmaMark-change the case of the string-(void) changestringcase{nsstring*STR1 =@"This is string1"; NSString*STR2 =@"This is STRING2"; //ALL caps[STR1 uppercasestring]; //All lowercase[STR2 lowercasestring]; //Capitalize first letter[str1 capitalizedstring];}#pragmaMark-searches Strings for substrings-(void) searchstring{nsstring*STR1 =@"This is String1"; NSString*STR2 =@" is"; Nsrange Range=[STR1 rangeofstring:str2]; NSLog (@"Location:%lu,length:%lu", (unsignedLong) range.location, (unsignedLong) range.length); }#pragmaMark-replace string-(void) replacestring{nsstring*strl =@"Hello china"; NSString*STRN = [strL stringbyreplacingoccurrencesofstring:@" china"Withstring:@"Beijing"]; NSLog (@"strl:%@,strn:%@", strl,strn);}#pragmamark-delimited string array-(void) componentsstring{nsstring*str =@"a b c d e"; //separating string array with spacesNsarray *arr = [str componentsseparatedbystring:@" "]; NSLog (@"Arr:%@,arr.count:%lu", arr, (unsignedLong) arr.count); }#pragmaMark-arrays are stitched into strings-(void) Arraytostring{nsarray*array = [nsarray arraywithobjects:@" this",@" is",@"String", nil]; //to separate elements in an array with spacesNSString *str = [array componentsjoinedbystring:@" "]; NSLog (@"str:%@", str);}#pragmaMark-extracts a new string from the string-(void) drawnewstring{nsstring*str =@"The is String"; //intercepts from the beginning of the string to the specified position, but does not include the character at that Position.NSString *str1 = [str substringtoindex:5]; //starts at the specified position (including a custom-positioned String) until the endNSString *str2 = [str substringfromindex:5]; //arbitrarily intercepts a new string from a string, given its location and lengthNSString *STR3 = [str Substringwithrange:nsmakerange (4,5)]; NSLog (@"str1:%@,str2:%@,str3:%@", str1,str2,str3);}</pre>two, variable string<pre>- (void) nsmutablestringoperation{//assigning capacity to stringsnsmutablestring *STRM = [nsmutablestring stringwithcapacity: -]; NSLog (@"strm:%@", strM); //Add a string after an existing stringnsmutablestring *strm1 = [[nsmutablestring alloc] initwithstring:@"This is a"]; NSLog (@"strm1:%@", strM1); [strM1 appendString:@"nsmutablestring"]; NSLog (@"strm1:%@", strM1); //deletes a character in an existing string according to the given range and length[strM1 Deletecharactersinrange:nsmakerange (0,5)]; NSLog (@"strm1:%@", strM1); //inserts a string at the specified position in a string[strM1 insertstring:@"Hello"Atindex:0]; NSLog (@"strm1:%@", strM1); //Replace an existing string with another string[strM1 setString:@"Hello world"]; NSLog (@"strm1:%@", strM1); //replaces the original string with a new string according to the given range[strM1 Replacecharactersinrange:nsmakerange (0,5) withstring:@"Hi"]; NSLog (@"strm1:%@", strM1);}</pre>three, time operation<pre>- (void) nsdateoperation{//get the current dateNSDate *date1 =[nsdate date]; NSLog (@"date:%@", date1); NSDate*date2 = [nsdate Datewithtimeintervalsincenow:3]; //get current Time: corefoundation frame method DoubleCurrentTime =cfabsolutetimegetcurrent (); //Compare Dates://<1> comparison dates are the sameBOOL result =[date1 isequaltodate:date2]; //<2> Compare dates return earlier datesNSDate *datee =[date1 earlierdate:date2]; //<3> Compare dates return a later dateNSDate *datel =[date1 laterdate:date2]; NSLog (@"result:%d, datee:%@, datel:%@", result,datee,datel); //Format a dateNSDateFormatter *formatter =[[nsdateformatter alloc] init]; //set several default display effects[formatter settimestyle:nsdateformattermediumstyle]; //Custom Date Display effect, h capitalization is 24 hour timekeeping[formatter setdateformat:@"YYYY-MM-DD HH:mm:ss"]; NSString*time =[formatter stringfromdate:date1]; NSLog (@"%@", time); }</pre>iOS network development toolset----string operations and time operations

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