iOS中的泛型

demo.m

#import "ViewController.h"

@interface ViewController ()

@property (strong, nonatomic) NSMutableArray<NSNumber*> *numbersArray;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.numbersArray = [NSMutableArray new];
    NSObject *o = [NSObject new];
    [self.numbersArray addObject:o];//产生警告,incompatible pointer types sending 'NSObject*' to parameter of type 'NSNumber* _Nonnull'
    [self.numbersArray addObject:@(1)];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end