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浅谈OC对象初始化的三种姿势
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 1UIView *v1 = nil;{ UIView *v = [UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 100)]; v.backgroundColor = [UIColor whiteColor]; v1 = v;}// view 2UIView *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builder模式。使用block隔离初始化代码。
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
使用。代码简洁工整。处处都是文艺范。
- (void) foo {// 使用// view 1UIView *v1 = [UIView z0_builder:^(UIView *that) { that.frame = CGRectMake(0, 0, 320, 200); that.background = [UIColor whiteColor];}];// view 2UIView *v2 = [[UIView alloc] init];[v2 z0_builder:^(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~~
- (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];}
浅谈OC对象初始化的三种姿势
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