多线程的简单使用

// ViewController.m

// Test

// Created by 路灯下的黑猫 on 2018/8/24.

#import "ViewController.h"

staticNSIntegerconstAddTag =100;

@interface ViewController ()

@property (nonatomic, strong) UIImageView *imageView;

@property (nonatomic, strong) NSArray *urlArr;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.urlArr = @[@"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",

@"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",

@"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",

@"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg",

@"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",

@"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",

@"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",

@"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg",

@"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",

@"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",

@"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",

@"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg"];

/*简单线程**/

//[self thread];

/* 队列操作**/

//[self operation];

/*GCD**/

[selfGCD];

}

/********** 线程Thread 操作 ************/

- (void)thread {

_imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

[self.view addSubview:_imageView];

UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame=CGRectMake(50,500,220,25);

[buttonsetTitle:@"加载图片" forState:UIControlStateNormal];

//添加方法

[buttonaddTarget:self action:@selector(threadClick) forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

- (void)threadClick {

[NSThread detachNewThreadSelector:@selector(threadRun) toTarget:self withObject:nil];

}

- (void)threadRun {

NSLog(@"callMainbefore_1");

NSURL*url=[NSURLURLWithString:self.urlArr.firstObject];

NSData *data=[NSData dataWithContentsOfURL:url];

NSLog(@"callMainbefore_2");

直到 updateUI: 做完了是否才开始往下操作

waitUntilDone:NO

2016-06-02 17:13:47.618 多线程处理[10042:208753] callMainbefore_1

2016-06-02 17:13:47.673 多线程处理[10042:208753] callMainbefore_2

2016-06-02 17:13:47.674 多线程处理[10042:208753] callMainAfter

2016-06-02 17:13:52.675 多线程处理[10042:208668] callMain

waitUntilDone:YES

2016-06-02 17:16:05.525 多线程处理[10062:210446] callMainbefore_1

2016-06-02 17:16:05.607 多线程处理[10062:210446] callMainbefore_2

2016-06-02 17:16:10.609 多线程处理[10062:210347] callMain

2016-06-02 17:16:10.613 多线程处理[10062:210446] callMainAfter

**/

[self performSelectorOnMainThread:@selector(updateUI:) withObject:data waitUntilDone:YES];

NSLog(@"callMainAfter");

}

- (void)updateUI:(NSData*)imageData {

sleep(5);

NSLog(@"callMain");

self.imageView.image= [UIImageimageWithData:imageData];

}

/********** 线程Thread 结束 ************/

/********** 队列操作 ************/

- (void)operation {

CGFloatspace =10;

CGFloatimageWH = (320-10*5)/4.0;

for(NSIntegeri =0; i

UIImageView* imageView = [[UIImageViewalloc]init];

[self.viewaddSubview:imageView];

imageView.frame=CGRectMake(space +(space+imageWH)*(i%4), space +(space+imageWH)*(i/4), imageWH, imageWH);

imageView.tag=AddTag+ i;

}

UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame=CGRectMake(50,500,220,25);

[buttonsetTitle:@"加载图片" forState:UIControlStateNormal];

[buttonaddTarget:self action:@selector(operationClick) forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

- (void)operationClick {

NSOperationQueue * queue = [[NSOperationQueue alloc]init];

queue.maxConcurrentOperationCount = 2;

__weak typeof(self)weakSelf = self;

for(NSIntegeri =0; i

UIImageView* imageView = [self.viewviewWithTag:AddTag+i];

imageView.image=nil;

NSBlockOperation * blockOp = [NSBlockOperation blockOperationWithBlock:^{

NSURL*url=[NSURLURLWithString:weakSelf.urlArr[i]];

NSData*data=[NSDatadataWithContentsOfURL:url];

dispatch_async(dispatch_get_main_queue(), ^{

//更新UI 需要主线程

imageView.image= [UIImageimageWithData:data];

});

}];

if(i >0) {

/* 就是依赖前面的**/

NSBlockOperation* preOperation = queue.operations[i-1];

[blockOpaddDependency:preOperation];

}

[queueaddOperation:blockOp];

}

/********** 队列操作结束 ************/

/****************** GCD ******************/

- (void)GCD {

CGFloatspace =10;

CGFloatimageWH = (320-10*5)/4.0;

for(NSIntegeri =0; i

UIImageView* imageView = [[UIImageViewalloc]init];

[self.viewaddSubview:imageView];

imageView.frame=CGRectMake(space +(space+imageWH)*(i%4), space +(space+imageWH)*(i/4), imageWH, imageWH);

imageView.tag=AddTag+ i;

}

UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame=CGRectMake(50,500,220,25);

[buttonsetTitle:@"加载图片" forState:UIControlStateNormal];

//添加方法

[buttonaddTarget:self action:@selector(GCDClick) forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

/* 串行执行**/

- (void)GCDClick {

__weak typeof(self)weakSelf = self;

dispatch_queue_tserialQueue =dispatch_queue_create("LeeGCDQueue",DISPATCH_QUEUE_SERIAL);

for(NSIntegeri =0; i

UIImageView* imageView = [self.viewviewWithTag:AddTag+i];

imageView.image=nil;

dispatch_async(serialQueue, ^{

NSURL*url=[NSURLURLWithString:weakSelf.urlArr[i]];

NSData*data=[NSDatadataWithContentsOfURL:url];

dispatch_async(dispatch_get_main_queue(), ^{

//更新UI 需要主线程

imageView.image= [UIImageimageWithData:data];

});

}

///* 并发执行**/

//- (void)GCDClick {

// __weak typeof(self)weakSelf = self;

// dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

// for (NSInteger i = 0 ; i < self.urlArr.count; i++) {

// UIImageView * imageView = [self.view viewWithTag:AddTag+i];

// imageView.image = nil;

// dispatch_async(globalQueue, ^{

// NSURL *url=[NSURL URLWithString:weakSelf.urlArr[i]];

// NSData *data=[NSData dataWithContentsOfURL:url];

// dispatch_async(dispatch_get_main_queue(), ^{

// //更新UI 需要主线程

// imageView.image = [UIImage imageWithData:data];

// });

// }

//}

/****************** GCD 结束 ******************/

@end

多线程的简单使用

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