OC自定义构造方法，初始化私有变量

example.code

// human.h：

#import <Foundation/Foundation.h>  
  
@interface Human : NSObject  
{  
    int age;  
    NSString *name;  
}  
-(id)initWithAge:(int)a Name:(NSString *)n;  
-(int)age;  
-(NSString *)name;  
@end   

// human.m:
#import "Human.h"  
  
@implementation Human  
-(id)init  
{  
    if(self=[super init])  
    {  
        age=20;  
        name=@"holy";  
    }  
    return self;  
}  
-(id)initWithAge:(int)a Name:(NSString *)n  
{  
    if (self=[super init]) {  
        age=a;  
        [name release];  
          
        name=[n copy];  
    }  
    return self;  
     
}  
-(int)age  
{  
    return age;  
}  
-(NSString *)name  
{  
    return name;  
}  
@end  

//main.m:
#import <Foundation/Foundation.h>  
#import "Human.h"  
int main(int argc, const char * argv[])  
{  
    NSAutoreleasePool *pool;  
    pool =[[NSAutoreleasePool alloc] init];  
      
    Human * human1 = [[Human alloc] init];  
    NSLog(@"名字%@,年龄%d",[human1 name],[human1 age]);  
      
    Human * human2 = [[Human alloc] initWithAge:100 Name:@"GOD"];  
    NSLog(@"名字%@,年龄%d",[human2 name],[human2 age]);  
      
      
    [human1 release];  
    [human2 release];  
    [pool release];//相当于对池中每个对象执行了一次release;  
      
  
}  

gistfile1.txt

//  GuideViewController.h
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIScrollViewDelegate>
{
@private BOOL hideFlag;
}
@end

/*-----------------华丽的分隔线----------------------*/
//GuideViewController.m
@implementation ViewController

- (id) initWithNoButton:(BOOL) theHideButton
{
    hideFlag = theHideFlag;
    return self;
}
//some method will invoke hideFlag
-(void)someMethod
{
    .......
    if (!hideFlag) {
        [self initBtn];
    }
}

@end
/*-----------------华丽的分隔线----------------------*/

//some othe class invoke above class

@implementation otherViewController

-(void) methodA
{
  ....
  ViewController *viewController = [[ViewController alloc] initWithNoButton:YES];
  //这个很重要，当在navigationController pushViewController时，被pull的controller如果是一个UIScrollView则一定要加这个，不然
  //1.图片上下会动到边界外。 2.导航回到上一视图时程序会崩溃
  viewController.automaticallyAdjustsScrollViewInsets = NO;
  ....
}

@end