使用dispatch_once
+ (instancetype)instance {
static PSDrawerManager *manager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [[PSDrawerManager alloc] init];
});
return manager;
}
微信扫一扫
使用dispatch_once
+ (instancetype)instance {
static PSDrawerManager *manager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [[PSDrawerManager alloc] init];
});
return manager;
}
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