比較的よく使うのでメモとしてエントリー
Singleton.h
#import <Foundation/Foundation.h>
@interface Singleton : NSObject {
}
+ (id)instance;
Singleton.ｍ
@implementation Singleton
static id _instance = nil;
+ (id)instance
{
@synchronized(self) {
if (!_instance) {
[[self alloc] init];
}
}
return _instance;
}
+ (id)allocWithZone:(NSZone *)zone
{
@synchronized(self) {
if (!_instance) {
_instance = [super allocWithZone:zone];
return _instance;
}
}
return nil;
}
- (id)copyWithZone:(NSZone *)zone
{
return self;
}
- (id)retain
{
return self;
}
- (unsigned)returnCount
{
return UINT_MAX;
}
- (void)release
{
}
- (id)autorelease
{
return self;
}
@end
[...] Singleton(dispatch_once版) On 2011年12月1日, in Objective-C, by タカ Objective-Cのシングルトンは以前書いたけど、 [...]