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(, , , )];
v1.backgroundColor = [UIColor whiteColor]; // view 2 UIView *v2 = [UIView alloc] initWithFrame:CGRectMake(, , , )];
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(, , , )];
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];
}
路人饼写法
// view 1
UIView *v1 = nil;
{
UIView *v = [UIView alloc] initWithFrame:CGRectMake(, , , )];
v.backgroundColor = [UIColor whiteColor];
v1 = v;
} // view 2
UIView *v2 = nil;
{
UIView *v = [UIView alloc] initWithFrame:CGRectMake(, , , )];
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 1
UIView *v1 = [UIView z0_builder:^(UIView *that) {
that.frame = CGRectMake(, , , );
that.background = [UIColor whiteColor];
}];
// view 2
UIView *v2 = [[UIView alloc] init];
[v2 z0_builder:^(UIView *that) {
that.frame = CGRectMake(, , , );
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。
- (void) foo {
// view 1
UIView *v1 = ({
UIView *v = [UIView alloc] init];
v.frame = CGRectMake(, , , );
v.background = [UIColor whiteColor];
v;
});
// view2
UIView *v2 = ({
UIView *v = [UIView alloc] init];
v.frame = CGRectMake(, , , );
v.background = [UIColor blueColor];
v;
});
[self.view addSubview:v1];
[self.view addSubview:v2];
}