保留我新创建的NSSet

Question

我有两个按钮：button1和button2。我想为每个触摸的对应按钮创建一个NSSet，并希望在触摸按钮2时显示set1值，反之亦然。按下按钮1时只打印集合1，按下按钮2时只打印集2。如何保留在按钮1操作中创建的集合，以便在按下按钮2时显示/使用。看看我的简单代码

在实施中，我有：

- (IBAction)button1:(UIButton *)sender {
    //somecode
    selectionButton1 = [[NSMutableArray alloc ] initWithObjects:@0,@1,@1,@4,@6,@11, nil];
    NSMutableSet *set1 = [NSMutableSet setWithArray: selectionButton1];
    NSLog(@"selectionButton1  = %@", set1);
    NSLog(@"selectionButton2  = %@", set2);
}

- (IBAction)button2:(UIButton *) sender {
    //somecode
    selectionButton2 = [[NSMutableArray alloc ] initWithObjects:@0,@5,@6,@7,@8,@10, nil];
    NSMutableSet *set2 = [NSMutableSet setWithArray: selectionButton2];
    NSLog(@"selectionButton1  = %@", set1);
    NSLog(@"selectionButton2  = %@", set2);
}

Answer 1

为集合生成属性。如果您不需要从其他类访问它们，请在.m文件的私有类扩展名中使它们成为内部属性。然后使用self.propertyName访问属性：

MyClass.m:

@interface MyClass // Declares a private class extension
@property (strong, nonatomic) NSMutableSet *set1;
@property (strong, nonatomic) NSMutableSet *set2
@end
@implementation MyClass
- (IBAction)button1:(UIButton *)sender {
    //somecode
    selectionButton1 = [[NSMutableArray alloc ] initWithObjects:@0,@1,@1,@4,@6,@11, nil];
    self.set1 = [NSMutableSet setWithArray: selectionButton1];
    NSLog(@"selectionButton1  = %@", self.set1);
    NSLog(@"selectionButton2  = %@", self.set2);
}

- (IBAction)button2:(UIButton *) sender {
    //somecode
    selectionButton2 = [[NSMutableArray alloc ] initWithObjects:@0,@5,@6,@7,@8,@10, nil];
    self.set2 = [NSMutableSet setWithArray: selectionButton2];
    NSLog(@"selectionButton1  = %@", self.set1);
    NSLog(@"selectionButton2  = %@", self.set2);
}
@end

有关属性的更多信息，请参阅苹果的文档。