//1.invacationOperation
注意:在默认情况下,调用start方法后,并不会开启一条新的线程去执行操作,而是在当前线程同步执行操作;只有将NSOperation放到NSOperationQueue中,才会异步执行操作
-(void)invocationOperation
{
NSInvocationOperation *ip = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(operation ) object:nil];
[ip start];
// [self performSelector:@selector(operation) withObject:nil];
}
//2.blockOperation
注意:只要NSBlockOperation封装的操作数大于1,就会开启新线程,异步执行
-(void)blockOperation
{
NSBlockOperation *bp = [NSBlockOperation blockOperationWithBlock:^{
//在主线程中完成
NSLog(@"--1--%@",[NSThread currentThread]);
}];
//额外任务在子线程完成
[bp addExecutionBlock:^{
NSLog(@"--2--%@",[NSThread currentThread]);
}];
[bp start];
//3.自定义PJXCustomOperation继承NSOperation
#import <Foundation/Foundation.h>
@interface PJXCustomOperation : NSOperation
@end
#import "PJXCustomOperation.h"
@implementation PJXCustomOperation
//在实现文件中实现-main方法
-(void)main
{
NSLog(@"--1--%@",[NSThread currentThread]);
}
//自定义
-(void)customOperation
{
PJXCustomOperation *cp = [[PJXCustomOperation alloc]init];
}
}
-(void)operation
{
NSLog(@"---1---%@",[NSThread currentThread]);
}
4.NSOperationQueue:
1)作用:如果将NSOperation添加到NSOperationQueue中,系统会异步执行NSOperation操作
2)添加:
方法一:调用addOperation:的方法
方法二:调用addOperationWithBlock:的方法
5.NSOperationQueue与GCD
GCD队列形式:1)全局 2)主队列 3)串行(自己创建的) 4)并行队列(自己创建)
NSOperationQueue队列形式:1)主队列 2)自己创建的
NSOperationQueue *operationQueue = [[NSOperationQueue alloc ]init];
NSInvocationOperation *op = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(operation) object:nil];
// [operationQueue addOperation:op];
[operationQueue addOperationWithBlock:^{
NSLog(@"--2--%@",[NSThread currentThread]);
}];
-(void)operation{
NSLog(@"--1--%@",[NSThread currentThread]);
}
