Tips for translating iOS development strings

/dictionary or array into nsstring

Nsarray *arr = [Nsarray arraywithobject:@ "1"];

NSString *str = [arr jsonstring]; Convert an array or dictionary into a JSON string

Nsarray *arr1 = [str objectfromjsonstring]; JSON string into a dictionary or array

NSData *data = [arr1 jsondata]; Convert the JSON string to NSData

NSString *STR1 = [[NSString alloc] initwithdata:data encoding:nsutf8stringencoding];//switch NSData to NSString
NSData *data1 = [str1 datausingencoding:nsutf8stringencoding]; Turn the nsstring into a nsdata

Binary flow becomes string

NSString *str=[[nsmutablestring alloc] initWithData:self.receiveDataencoding:NSUTF8StringEncoding];

Change the content

Str=[str stringbyreplacingoccurrencesofstring:@ "," withstring:@ ", \ n"];

Str=[str stringbyreplacingoccurrencesofstring:@ "{" withstring:@ "{\ n"];

Str=[str stringbyreplacingoccurrencesofstring:@ "}" withstring:@ "\ n}"];

NSLog (@ "%@", str);

Convert a string into a binary stream

Self.receivedata=[nsmutabledata Datawithdata:[str Datausingencoding:nsutf8stringencoding]];

Request changed to URL

Nsurl *url=[request URL];

URL changed to NSString

NSString *str=[[url absolutestring] stringbyreplacingpercentescapesusingencoding:nsutf8stringencoding];

NSLog (@ "%@", str);

Nsurl *url=[nsurl urlwithstring:@ "Http://img3.xooimage.com/files/6/1/3/firefox-logo-200x200-19f78a.png"];

Web site into a binary stream

Nsmutabledata *data=[nsmutabledata Datawithcontentsofurl:url];

UIImage *image=[uiimage Imagewithdata:data];

Read file

NSString *filepath = [[NSBundle mainbundle] pathforresource:@ "Students" oftype:@ "xml"];

File into a binary stream

NSData *data = [NSData Datawithcontentsoffile:filepath];

Take out the first letter

NSString *name = [City objectforkey:@ "name"];

NSString *firststr=[name substringwithrange:nsmakerange (0, 1)];

Remove an array directly from a string

NSString *str = [NSString stringwithformat:@ "Norman,stanley,fletcher"];

Nsarray *arr = [str componentsseparatedbystring:@ ","];

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

transcoding

URLSTR = [Urlstr stringbyaddingpercentescapesusingencoding:nsutf8stringencoding];

Tips for translating iOS development strings