Nsdictionary initialization and some common methods

Nsdictionary

// Initialize 1.

Nsdictionary * dic11 = [[nsdictionary alloc] initwithobjects: @ [@ "qwe", @ "ASD", @ "zxc", @ "QAZ", @ "wsx"] forkeys: @ [@ "111", @ "222", @ "333", @ "444", @ "555"];

// Obtain all the keys and values respectively.

Nslog (@ "% @", dic11.allkeys );

Nslog (@ "% @", dic11.allvalues );

// Obtain the total number of dictionary key-value pairs

Nslog (@ "% d", (dic11.count ));

// Dictionary traversal and quick Enumeration

For (ID key in dic11 ){

ID value = [dic11 objectforkey: Key];

Nslog (@ "% @: % @", key, value );

}

// You can initialize a literal constant like an immutable dictionary. The key is in the front and the value is in the back.

Nsdictionary * [email protected] {@ "Keya": @ "AAA", @ "keyb": @ 111 };

Nslog (@ "% @", dic00 );

 

 

// Other initialization Methods

// Initialization of a key-Value Pair dictionary

 

Nsdictionary * dic1 = [nsdictionary dictionarywithobject: @ "10001" forkey: @ "000"];

 

// Initialize dictionary with the same content as dic1

 

Nsdictionary * dic0 = [nsdictionary dictionarywithdictionary: dic1];

 

// Initialize the dictionary with multiple key-value pairs

Nsdictionary * dic2 = [nsdictionary dictionarywithobjects: @ [@ "11", @ "22", @ "33", @ "44"] forkeys: @ [@ "first ", @ "second", @ "third", @ "four"];

 

 

// Initialize the dictionary with multiple key-value pairs 2

Nsdictionary * dic3 = [nsdictionary dictionarywithobjectsandkeys ", @ "Xiang zhiduo", @ "tease the Holy Buddha", nil];

 

Nslog (@ "% @", dic3 [@ ""]);

 

// Create a variable dictionary with the same content as dic2

Nsmutabledictionary * dic4 = [nsmutabledictionary dictionarywithdictionary: dic2];

 

 

// Insert a key-value pair with the same name to overwrite the original value

[Dic4 setobject: @ "jjj" forkey: @ "Jiji"];

Nslog (@ "% @", dic4 );

 

// Insert a key-value pair with the same name to overwrite the original value

[Dic4 setobject: @ "999" forkeyedsubscript: @ "Lan"];

[Dic4 setobject: @ "004" forkeyedsubscript: @ "four"];

Nslog (@ "% @", dic4 );

// Splice dic1 to the front of DIC

[Dic4 addentriesfromdictionary: dic1];

Nslog (@ "% @ ------", dic4 );

// Remove a key-Value Pair

[Dic4 removeobjectforkey: @ "third"];

Nslog (@ "% @", dic4 );

// Remove the key-value pair corresponding to the key in the array

[Dic4 removeobjectsforkeys: @ [@ "five", @ "000"];

Nslog (@ "% @", dic4 );

// Replace all the original content of dic4 with the content of dic11.

[Dic4 setdictionary: dic11];

Nslog (@ "% @", dic4 );

// Save the dictionary content to the file in the specified path

[Dic4 writetofile: @ "/users/Apple/desktop/dic4.plist" atomically: Yes];

// Read the file content from the specified path

Nsdictionary * dic5 = [nsdictionary dictionarywithcontentsoffile: @ "/users/Apple/desktop/dic4.plist"];

Nslog (@ "% @", dic5 );

// Dict3 and dict2 have the same content and are essentially a new object.

// Dictionary is an initialization method for retrieving content from a specified path file. The file must exist. Otherwise, the content is empty.

Nsdictionary * dic6 = [[nsdictionary alloc] initwithcontentsoffile: @ "/users/Apple/desktop/dic4.plist"];

Nslog (@ "% @", dic6 );

 

// Remove all key-value pairs.

[Dic4 removeallobjects];

Nslog (@ "% @", dic4 );