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，纯属陆仁辈。
陆仁贾写法：
// view 1
UIView *v1 = [UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 100)];
v1.backgroundColor = [UIColor whiteColor];
// view 2
UIView *v2 = [UIView alloc] initWithFrame:CGRectMake(0, 120, 200, 100)];
v2.backgroundColor = [UIColor whiteColor];
// add to view
[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(0, 0, 200, 100)];
v.backgroundColor = [UIColor whiteColor];
v1 = v;
[self.view addSubview:v1];
}
// view 2
{
UIView *v2 = nil;
UIView *v = [UIView alloc] initWithFrame:CGRectMake(0, 120, 200, 100)];
v.backgroundColor = [UIColor whiteColor];
v2 = v;
[self.view addSubview:v2];
}
路人饼写法
// view 1
UIView *v1 = nil;
{
UIView *v = [UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 100)];
v.backgroundColor = [UIColor whiteColor];
v1 = v;
}
// view 2
UIView *v2 = nil;
{
UIView *v = [UIView alloc] initWithFrame:CGRectMake(0, 120, 200, 100)];
v.backgroundColor = [UIColor whiteColor];
v2 = v;
}
[self.view addSubview:v1];
[self.view addSubview:v2];
二、文艺程序猿
文艺程序猿，使用教科书姿势登场。使用模板方法模式。使用block隔离初始化代码。
谢谢@ArthurK的指正。使用模板方法来进行对象初始化。
首先给NSObject增加扩展接口
// 扩展NSObject，增加Builder接口
@interface NSObject (Creator)
+ (instancetype)z0_create:(void(^)(id that))block;
- (instancetype)z0_create:(void(^)(id that))block;
@end
// 实现
@implementation NSObject (Creator)
+ (instancetype) z0_create:(void(^)(id))block {
instancetype instance = [[self alloc] init];
block(instance);
return instance;
}
- (instancetype) z0_create:(void(^)(id))block {
block(self);
return self;
}
@end
使用。代码简洁工整。处处都是文艺范。
- (void) foo {
// 使用
// view 1
UIView *v1 = [UIView z0_create:^(UIView *that) {
that.frame = CGRectMake(0, 0, 320, 200);
that.background = [UIColor whiteColor];
}];
// view 2
UIView *v2 = [[UIView alloc] init];
[v2 z0_create:^(UIView *that) {
that.frame = CGRectMake(0, 0, 320, 200);
that.background = [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？
其实....我也不知道！>_<# 自行领悟。
黑科技?🙃呵呵~~ 我就是代码少，你吹啊~~
补充：
语法：https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement-Exprs
- (void) foo {
// view 1
UIView *v1 = ({
UIView *v = [UIView alloc] init];
v.frame = CGRectMake(0, 0, 320, 200);
v.background = [UIColor whiteColor];
v;
});
// view2
UIView *v2 = ({
UIView *v = [UIView alloc] init];
v.frame = CGRectMake(0, 120, 320, 200);
v.background = [UIColor blueColor];
v;
});
[self.view addSubview:v1];
[self.view addSubview:v2];
}
总结
总结个鬼，就几行代码。爱干啥，干啥去~~ 白了个掰！
