[Objective-c] 010_foundation framework of Nsset and Nsmutableset

In the Cocoa Foundation, Nsset and Nsmutableset, like the nsarray functional nature, are used to store objects that belong to a collection. However, Nsset and Nsmutableset are unordered, guaranteeing the uniqueness of the data and will not have any effect when inserting the same data.

Nsset initialization and common operations

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

-(BOOL) application: (UIApplication *) application didFinishLaunchingWithOptions: (NSDictionary *) launchOptions {

NSSet * students = [NSSet setWithObjects: @ "xiao ming", @ "xiao hui", @ "da xiong", nil];
NSSet * teachers = [[NSSet alloc] initWithObjects: @ "principal", @ "Vice-Chancellor", @ "Director of politics and education", nil];
NSArray * array = [NSArray arrayWithObjects: @ "xiao ming", @ "xiao hui", @ "da xiong", @ "xiao li", nil];
NSSet * students_2 = [NSSet setWithArray: array];

NSLog (@ "students:% @", students);
NSLog (@ "teachers:% @", teachers);
NSLog (@ "students_2:% @", students_2);

// Get the number of objects contained in the collection students
NSLog (@ "students count:% lu", (unsigned long) students.count);

^ // Get all objects in the collection teachers as an array
NSArray * allTeacher = [teachers allObjects];
NSLog (@ "allObj:% @", allTeacher);

// Get any object in teachers
NSLog (@ "anyObj:% @", [teachers anyObject]);

^ // teachers contains an object
If ([teachers containsObject: @ "Vice principal"]) {
NSLog (@ "teachers has a vice principal");
}

^ // Whether contains the object in the specified set
If ([students_2 intersectsSet: students]) {
NSLog (@ "intersects");
}

Http: // Whether it exactly matches
If ([students_2 isEqualToSet: students]) {
NSLog (@ "exact match");
} Else {
NSLog (@ "exact match? NO ...");
}

^ /// Whether it is a sub-collection
(If [students isSubsetOfSet: students_2]) {
NSLog (@ "students isSubsetOf students_2");
}

Http: // Iterate through
NSEnumerator * enumerator = [teachers objectEnumerator];
NSObject * teacher = [enumerator nextObject];
While (teacher! = Nil) {
NSLog (Data in @ "teachers:% @", teacher);
Teacher = [enumerator nextObject];
}

^ // Fast enumeration
For (NSObject * teacher in teachers) {
NSLog (Data in @ "teachers:% @", teacher);
}

Return YES;
}

@end

Nsmutableset initialization and common operations

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

-(BOOL) application: (UIApplication *) application didFinishLaunchingWithOptions: (NSDictionary *) launchOptions {
    
    NSMutableSet * mutableStudent = [NSMutableSet setWithObjects: @ "F1", @ "F2", @ "F3", nil];
    NSMutableSet * mutableTeacher = [NSMutableSet setWithObjects: @ "B1", @ "B2", @ "B3", nil];
    NSMutableSet * mutableStudent2 = [NSMutableSet setWithObjects: @ "F1", @ "F2", @ "F3", @ "F4", nil];
    
    // Subtraction of collection elements
    [mutableStudent2 minusSet: mutableStudent];
    NSLog (@ "mutableStudent2 minus mutableStudent:% @", mutableStudent2);
    
    // mutableStudent2 leaves only equal elements
    [mutableStudent intersectSet: mutableStudent2];
    NSLog (@ "intersect:% @", mutableStudent2);
    
    // mutableStudent merge collection
    [mutableStudent unionSet: mutableStudent2];
    NSLog (@ "union:% @", mutableStudent);
    
    // mutableTeacher deletes the specified element
    [mutableTeacher removeObject: @ "好色 仙人"];
    NSLog (@ "removeObj:% @", mutableTeacher);
    
    // mutableTeacher deletes all data
    [mutableTeacher removeAllObjects];
    NSLog (@ "removeAll:% @", mutableTeacher);
    
    return YES;
}

@end 

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Reprinted from "Baby bus Superdo Team" original link: http://www.cnblogs.com/superdo/p/4623082.html

[Objective-c] 010_foundation framework of Nsset and Nsmutableset