IOS基礎(chǔ)NSOperation的操作優(yōu)先級(jí)和操作依賴(lài)

• 操作優(yōu)先級(jí)

// ViewController.m // 34-操作優(yōu)先級(jí) // Created by 魯軍 on 2021/3/9. #import "ViewController.h" @interface ViewController () //全局隊(duì)列 @property(nonatomic,strong)NSOperationQueue *queue; @end @implementation ViewController -(NSOperationQueue *)queue{if(_queue==nil){_queue = [[NSOperationQueue alloc] init];//設(shè)置最大并發(fā)數(shù) (并不是線(xiàn)程數(shù)字)//_queue.maxConcurrentOperationCount = 2;}return _queue; } - (void)viewDidLoad {[super viewDidLoad];//操作1NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{for(int i=0;i<20;i++){NSLog(@"op1 = %d",i);}}];//設(shè)置優(yōu)先級(jí)最高op1.qualityOfService = NSQualityOfServiceUserInteractive;[self.queue addOperation:op1];[op1 setCompletionBlock:^{//執(zhí)行在子線(xiàn)程上的NSLog(@"===========op1 操作完成執(zhí)行的=========%@",[NSThread currentThread]);}];//操作2NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{for(int i=0;i<20;i++){NSLog(@"op2 = %d",i);}}];//設(shè)置優(yōu)先級(jí)最低op2.qualityOfService = NSQualityOfServiceBackground;[self.queue addOperation:op2]; } @end

• 操作依賴(lài)

// // ViewController.m // 35-操作依賴(lài) // // Created by 魯軍 on 2021/3/9. //#import "ViewController.h"@interface ViewController () //全局隊(duì)列 @property(nonatomic,strong)NSOperationQueue *queue; @end @implementation ViewController -(NSOperationQueue *)queue{if(_queue==nil){_queue = [[NSOperationQueue alloc] init];//設(shè)置最大并發(fā)數(shù) (并不是線(xiàn)程數(shù)字)//_queue.maxConcurrentOperationCount = 2;}return _queue; } - (void)viewDidLoad {[super viewDidLoad];//下載 解壓 升級(jí)完成NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{NSLog(@"下載");}];NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{[NSThread sleepForTimeInterval:2.0];NSLog(@"解壓");}];NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{NSLog(@"升級(jí)完成");}];//設(shè)置操作間的依賴(lài)[op2 addDependency:op1];[op3 addDependency:op2];//會(huì)發(fā)生循環(huán)依賴(lài) ，什么都不操作//操作添加到隊(duì)列中[self.queue addOperations:@[op1,op2] waitUntilFinished:NO];//依賴(lài)關(guān)系可以跨隊(duì)列[[NSOperationQueue mainQueue] addOperation:op3]; }@end

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