详解IOS 单例的两种方式
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2021-01-05
01:11:51
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详解详解IOS 单例的两种方式单例的两种方式
详解详解IOS 单例的两种方式单例的两种方式
方法一：方法一：
#pragma mark -
#pragma mark sharedSingleton methods
//单例函数
static RtDataModel *sharedSingletonManager = nil;
+ (RtDataModel *)sharedManager
{
@synchronized(self) {
if (sharedSingletonManager == nil) {
sharedSingletonManager = [[self alloc] init];
}
}
return sharedSingletonManager;
}
+ (id)allocWithZone:(NSZone *)zone
{
@synchronized(self) {
if (sharedSingletonManager == nil) {
sharedSingletonManager = [super allocWithZone:zone];
return sharedSingletonManager; // assignment and return on first allocation
}
}
return nil; //on subsequent allocation attempts return nil
}
- (id)copyWithZone:(NSZone *)zone
{
return sharedSingletonManager;
}
- (id)retain
{
return sharedSingletonManager;
}
- (NSUInteger)retainCount
{
return UINT_MAX; //denotes an object that cannot be released
}
- (oneway void)release
{
//do nothing
}
- (id)autorelease
{
return sharedSingletonManager;
}
//单例函数结束
方法二：方法二：
.h文件
#import <Foundation/Foundation.h>
@interface RtTestDataModel : NSObject
{
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