IOS基礎NSOperation的操作優先級和操作依賴

• 操作優先級

// ViewController.m // 34-操作優先級 // Created by 魯軍 on 2021/3/9. #import "ViewController.h" @interface ViewController () //全局隊列 @property(nonatomic,strong)NSOperationQueue *queue; @end @implementation ViewController -(NSOperationQueue *)queue{if(_queue==nil){_queue = [[NSOperationQueue alloc] init];//設置最大并發數 (并不是線程數字)//_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);}}];//設置優先級最高op1.qualityOfService = NSQualityOfServiceUserInteractive;[self.queue addOperation:op1];[op1 setCompletionBlock:^{//執行在子線程上的NSLog(@"===========op1 操作完成執行的=========%@",[NSThread currentThread]);}];//操作2NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{for(int i=0;i<20;i++){NSLog(@"op2 = %d",i);}}];//設置優先級最低op2.qualityOfService = NSQualityOfServiceBackground;[self.queue addOperation:op2]; } @end

• 操作依賴

// // ViewController.m // 35-操作依賴 // // Created by 魯軍 on 2021/3/9. //#import "ViewController.h"@interface ViewController () //全局隊列 @property(nonatomic,strong)NSOperationQueue *queue; @end @implementation ViewController -(NSOperationQueue *)queue{if(_queue==nil){_queue = [[NSOperationQueue alloc] init];//設置最大并發數 (并不是線程數字)//_queue.maxConcurrentOperationCount = 2;}return _queue; } - (void)viewDidLoad {[super viewDidLoad];//下載 解壓 升級完成NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{NSLog(@"下載");}];NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{[NSThread sleepForTimeInterval:2.0];NSLog(@"解壓");}];NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{NSLog(@"升級完成");}];//設置操作間的依賴[op2 addDependency:op1];[op3 addDependency:op2];//會發生循環依賴 ，什么都不操作//操作添加到隊列中[self.queue addOperations:@[op1,op2] waitUntilFinished:NO];//依賴關系可以跨隊列[[NSOperationQueue mainQueue] addOperation:op3]; }@end

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