0.在进行多线程的时候我们初始化一些数据
这里涉及到performSelectorOnMainThread 的操作
- (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**/
[self GCD];
}
1.Thread的简单操作
/********** 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);
[button setTitle:@"加载图片" forState:UIControlStateNormal];
//添加方法
[button addTarget:self action:@selector(threadClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)threadClick {
[NSThread detachNewThreadSelector:@selector(threadRun) toTarget:self withObject:nil];
}
- (void)threadRun {
NSLog(@"callMainbefore_1");
NSURL *url=[NSURL URLWithString: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 = [UIImage imageWithData:imageData];
}
/********** 线程Thread 结束 ************/
2.NSOperation 的操作
设计到 线程的依赖的描述
/********** 队列 操作 ************/
- (void)operation {
CGFloat space = 10;
CGFloat imageWH = (320 - 10*5)/4.0;
for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
UIImageView * imageView = [[UIImageView alloc]init];
[self.view addSubview: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);
[button setTitle:@"加载图片" forState:UIControlStateNormal];
[button addTarget:self action:@selector(operationClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)operationClick {
NSOperationQueue * queue = [[NSOperationQueue alloc]init];
queue.maxConcurrentOperationCount = 2;
__weak typeof(self)weakSelf = self;
for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
UIImageView * imageView = [self.view viewWithTag:AddTag+i];
imageView.image = nil;
NSBlockOperation * blockOp = [NSBlockOperation blockOperationWithBlock:^{
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];
});
}];
if (i >0) {
/* 就是 依赖前面的**/
NSBlockOperation * preOperation = queue.operations[i-1];
[blockOp addDependency:preOperation];
}
[queue addOperation:blockOp];
}
}
/********** 队列 操作结束 ************/
GCD 的简单使用
设计到 自定义的 串行队列和并发队列
/****************** GCD ******************/
- (void)GCD {
CGFloat space = 10;
CGFloat imageWH = (320 - 10*5)/4.0;
for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
UIImageView * imageView = [[UIImageView alloc]init];
[self.view addSubview: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);
[button setTitle:@"加载图片" forState:UIControlStateNormal];
//添加方法
[button addTarget:self action:@selector(GCDClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
/* 串行执行**/
- (void)GCDClick {
__weak typeof(self)weakSelf = self;
dispatch_queue_t serialQueue = dispatch_queue_create("LeeGCDQueue", DISPATCH_QUEUE_SERIAL);
for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
UIImageView * imageView = [self.view viewWithTag:AddTag+i];
imageView.image = nil;
dispatch_async(serialQueue, ^{
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];
});
});
}
}
///* 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 ******************/
