iOSApp使用设计模式中的模板方法模式开发的示例

// 初始化脚本协议 
@protocol YLSInitialScript  
 
- (void) doInit:(YLSClientInfo*) clientInfo; 
 
@end 

@interface YLSInitialScriptTemplate : NSObject 
 
-(id) initOrigin:(YLSInitialOperator *)operator; 
 
// 抽象方法，由子类实现 
- (void) createEverythingForFirstTime; 
- (void) update; 
- (NSString*) stepMsg; 
 
@end 

@implementation YLSInitialScriptTemplate 
 
YLSInitialOperator *origin; 
 
-(id) initOrigin:(YLSInitialOperator *)operator 
{ 
    origin = operator; 
    return self; 
} 
 
- (void) doInit:(YLSClientInfo*) clientInfo 
{ 
    if ([clientInfo shouldInit]) { 
        [self createEverythingForFirstTime];// 无表，初始化 
    } else if ([clientInfo shouldUpdate]) { 
        [self update];// 升级 
    } 
    [origin notifyStepDone:[self stepMsg]];// 通知Bootstrap View Controller刷新进度条 
} 
 
// 以下3个是抽象方法，延迟到子类实现 
- (void) createEverythingForFirstTime 
{ 
    [self doesNotRecognizeSelector:_cmd]; 
} 
 
- (void) update 
{ 
    [self doesNotRecognizeSelector:_cmd]; 
} 
 
- (NSString*) stepMsg 
{ 
    [self doesNotRecognizeSelector:_cmd]; 
    return nil; 
} 
 
@end 

@interface YLSServiceDataInitScript : YLSInitialScriptTemplate 
 
@end 

@implementation YLSServiceDataInitScript 
 
- (void) createEverythingForFirstTime 
{ 
    // 具体逻辑 
} 
 
- (void) update 
{ 
} 
 
- (NSString*) stepMsg 
{ 
    // 具体逻辑 
} 
 
@end 

[self doesNotRecognizeSelector:_cmd]; 

        scripts = [NSMutableArray new]; 
         
        // 需要执行的脚本依次添加在下面 
        [scripts addObject:[[YLSShowDataInitScript new] initOrigin:self]]; 
        [scripts addObject:[[YLSServiceDataInitScript new] initOrigin:self]]; 
        [scripts addObject:[[YLSMemberDataInitScript new] initOrigin:self]]; 
        [scripts addObject:[[YLSBillDataInitScript new] initOrigin:self]]; 
        [scripts addObject:[[YLSEmployeeDataInitScript new] initOrigin:self]]; 
        [scripts addObject:[[YLSBackupDataInitScript new] initOrigin:self]]; 
 
for (int i = 0; i <[scripts count]; i++) { 
        [[scripts objectAtIndex: i] doInit:clientInfo]; 
    }