Swift中懒加载(lazy initialization)的实现
Swift中是存在和OC一样的懒加载机制的,但是这方面国内的资料比较少,今天把搜索引擎换成了Bing后发现用Bing查英文\最新资料要比百度强上不少。
我们在OC中一般是这样实现懒加载初始化的:
1: @property (nonatomic, strong) NSMutableArray *players;
2:
3: - (NSMutableArray *)players {
4: if (!_players) {
5: _players = [[NSMutableArray alloc] init];
6: }
7: return _players;
8: }
而用百度搜“swift 懒加载 lazy”却没有像样的资料,都在照本宣科。
实际上我们可以这样写:
1: lazy var players: NSMutableArray = {
2: var temporaryPlayers = NSMutableArray()
3: temporaryPlayers.addObject("Mike Buss")
4: return temporaryPlayers
5: }()
完美解决问题!感谢Bing!
Lazy Initialization with Swift
http://www.tuicool.com/articles/I3mY7v
http://stackoverflow.com/questions/24068829/lazy-loading-properties-in-swift