Nsrange class in iOS

NsranGE 's definition

typedef struct _NSRANGE

{

Nsuinteger location;

Nsuinteger length;

} Nsrange;

Nsrange is a struct in which the location is an index that starts at 0, and length is a representation of how long the object is. They are all types of Nsuinteger . the NsuintEger type is defined as follows:

#if __lp64__ | | target_os_embedded | | Target_os_iphone | | Target_os_win32 | | Ns_build_32_liKe_64

Typedef unsigned long nsuinteger;

#else

Typedef unsigned int nsuinteger;

#endif

Example:

The following example will output the IPA

NSString *homebrew = @ "Imperial India Pale Ale (IPA)";

Starting at position, get 3 Characters

NSRange Range = NSMakerange (3);

This wouLD also work:

Nsrange range = {3};

NSLog (@ "Beer shortname:%@", [homebrew substringwithrange:range]);

Search string:

NSString *homebrew = @ "Imperial India Pale Ale (IPa)";

Nsrange range = [Homebrew rAngeofstring:@ "IPA"];

Did we find the STring "IPA"?

if (RAnge.length > 0)

NSLog (@ "range is:%@", Nsstringfromrange (range));

The above program will output RAnge is: {3}. Nsstringfromrange () method to return a nsrange to a nsstring. Another function, nsrangefromstring (), is to convert nsstring to Nsrange

The following example will reverse the search string from backward forward:

NSString *homebrew = @ "Imperial India Pale Ale (IPA)";

Search for the ' IA ' starting at the end of String

Nsrange range = [Homebrew Rangeofstring:@ "ia" options:nsbackwArdssearch];

What did we find

if (RAnge.length > 0)

NSLog (@ "range is:%@", Nsstringfromrange (range));

The above program will be output :Range is: {2} ("IA" appears in the word "India" )

Ac

If you want to get a string or a subset of an array, it is convenient to use Nsrange to define the subset.

Nsrange Definition

Declaration:typedef struct _nsrange {

Nsuinteger location;

Nsuinteger length;

} Nsrange;

To create a method definition for Nsrange

Declaration:nsrange Nsmakerange (

Nsuinteger Loc,

Nsuinteger Len

);

For example, get a subset of an array:

Nsrange range = NSMakeRAnge (0, 5);

Nsarray *subarray = [self.states subarraywithrange:range];

This gives you a subset of the 5 elements that begin with 0 in this array .

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Nsrange class in iOS