詳解IOS 單例的兩種方式
方法一：
#pragma mark - #pragma mark sharedSingleton methods //單例函數 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; } //單例函數結束 方法二：
.h文件
#import <Foundation/Foundation.h> @interface RtTestDataModel : NSObject { NSMutableArray * _buyDataTArray; NSMutableArray * _sellDataTArray; } + (RtTestDataModel *)sharedManager; - (void)addOptionBuyDataArrayModel: (NSMutableArray *)DataArray; - (NSMutableArray *)getOptionBuyDataArrayModel; @end .m文件
#import "RtTestDataModel.h" @implementation RtTestDataModel + (RtTestDataModel *)sharedManager { static RtTestDataModel *sharedManager = nil; static dispatch_once_t predicate; dispatch_once(&predicate,^{ sharedManager = [[RtTestDataModel alloc]init]; }); return sharedManager; } - (void)dealloc { [_buyDataTArray removeAllObjects]; [_buyDataTArray release]; [super dealloc]; } - (id)init { self = [super init]; if (self != nil) { _buyDataTArray = [[NSMutableArray alloc] initWithCapacity:8]; } return self; } - (void)addOptionBuyDataArrayModel: (NSMutableArray *)DataArray{ if (DataArray != nil) { [_buyDataTArray removeAllObjects]; [_buyDataTArray addObjectsFromArray:DataArray]; } } - (NSMutableArray *)getOptionBuyDataArrayModel{ return _buyDataTArray; } @end 如有疑問請留言或者到本站社區交流討論，感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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