详解IOS 单例的两种方式
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：
.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
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