浅谈Objective-C对象初始化的三类程序猿

序

早上看了位仁兄写了《Swift:让人眼前一亮的初始化方式》的文章。什么？！初始化？Objective-C！好吧，吓哔哔~~~

一、普通程序猿

普通程序员使用最常见路人姿势等场。普普通通，纯属

陆仁贾写法：

 // view1
 UIView *v1 = [UIView alloc] initWithFrame:CGRectMake(, , , )];
 v1.backgroundColor = [UIColor whiteColor];

 // view2
 UIView *v2 = [UIView alloc] initWithFrame:CGRectMake(, , , )];
 v2.backgroundColor = [UIColor greenColor];

 [self.view addSubview:v1];
 [self.view addSubview:v2];

撸人已写法：撸人已明显比陆仁贾聪明多了。使用大括号隔离，view1与view2相互独立，创建代码变量不会相互污染。

 // view 1
 {
     UIView *v1 = nil;

     UIView *v = [UIView alloc] initWithFrame:CGRectMake(, , , )];
     v.backgroundColor = [UIColor whiteColor];

     v1 = v;

     [self.view addSubview:v1];
 }

 // view 2
 {
     UIView *v2 = nil;

     UIView *v = [UIView alloc] initWithFrame:CGRectMake(, , , )];
     v.backgroundColor = [UIColor whiteColor];

     v2 = v;

     [self.view addSubview:v2];
 }

二、文艺程序猿

文艺程序猿，使用教科书姿势登场。使用builder模式。使用block隔离初始化代码。

1. 首先给NSObject增加扩展接口

 // 扩展NSObject，增加Builder接口
 @interface NSObject (Builder)

 + (id)z0_builder:(void(^)(id that))block;

 - (id)z0_builder:(void(^)(id that))block;

 @end

 // 实现
 @implementation NSObject (Builder)

 + (id)z0_builder:(void(^)(id))block {
     id instance = [[self alloc] init];
     block(instance);
     return instance;
 }

 - (id)z0_builder:(void(^)(id))block {
     block(self);
     return self;
 }

 @end

2. 使用

 - (void) foo {
   // 使用
   // view 1
   UIView *v1 = [UIView z0_builder:^(UIView *that) {
     that.frame = CGRectMake(, , , );
     that.backgroundColor = [UIColor whiteColor];
   }];

   // view 2
   UIView *v2 = [[UIView alloc] init];
   [v2 z0_builder:^(UIView *that) {
     that.frame = CGRectMake(, , , );
     that.backgroundColor = [UIColor whiteColor];
   }];

   // 添加到父视图
   [self.view addSubview:v1];
   [self.view addSubview:v2];
 }

三、二逼程序猿

最后入场的是二逼程序猿。！#！@#@%&……&%&#￥%！@#￥！@#￥!!!!! 这个是什么卵？是不是