Obj-C:
1.消息机制
[shape draw] 向该对象发送消息,该对象查找并运行此函数
差不多就是shape.draw();
2.中缀语法
[textThing setStringValue:@“Hello” color:[UIColor RedColor]];
3.代码重构:
减少重复代码,写成函数或者类
4.类的复合
汽车类由轮子类和车架类复合而成(伪多继承实现方式)
11.selector响应选择器
[car respondsToSelector:@selector(doxxx:)]
12.Category(类别)和类扩展
类别缺点:1.不能新加变量 2.重名会覆盖
Things为已有类
类别:(无法添加成员变量!)
@interface Things(Plus){
}
进行类扩展如下:(可以添加成员变量!)
@interface Things(){
}
13.协议和delegate委托(代理)
协议:
//协议定义
@protocol UpdateAlertDelegate <NSObject>
- (void)updateAlert;
@end
委托:协议基础上增加
@interface TimerControl : NSObject
//遵循协议的一个代理变量定义
@property (nonatomic, weak) id<UpdateAlertDelegate> delegate;
- (void) startTheTimer;
@end
14.block代码块:函数指针
创建:
int (^multiply_block)(int number)=^(int number){
return (number*number);
}
调用:
int result=multiply_block(5);
创建block变量:
typedef double (^MKSampleMultiply2BlockRef)(double c,double d);
MKSampleMultiply2BlockRef multiply2={ return c *d ; };
调用:
multiply2(4,5);
GCD多线程
15.调度队列:
1.连续队列
dispatch_queue_t my_serial_queue= dispatch_queue_create(“myQueue”,NULL);
2.并发队列
= dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY,0);
3.主队列
= dispatch_get_current_queue(void);
4.获取当前队列
= dispatch_get_current_queue();
16.程序调度
dispatch_block_t myBlock=^{ NSLog(@“A cute block!”) }
Block异步:dispatch_async(_serial_queue,^{ NSLog(@“TASK1 ”); });
Block异步:dispatch_async(_serial_queue,myBlock);
异步函数:dispatch_async_f(_serial_queue,(_bridge void*)[NSNumber numberWithInt:3],(dispatch_function_t)myDispatchFunction);
队列暂停:
dispatch_suspend(_serial_queue);
队列重新开始
dispatch_resume(_serial_queue);
_bridge关键字
告诉ARC交给系统管理内存
17 操作队列 NSOperationQueue
1.创建代码块操作
NSBlockOperation *blockOperation=[NSBockOperation blockOperationWithBlock:^{
}];
2.[blockOperation addExecutionBlock:^{
}];
队列操作
1.当前队列
NSOperationQueue *currentQueue=[NSOperationQueue currentQueue];
2.主队列
[NSOperationQueue mainQueue];
3.队列添加代码块
[theQueue addOperation:blockOperation];
[theQueue addOperation:^{
nslog(@“aaa”);
}];