IOS的三种多线程技术
ONE ------------------------------------------
#import "ViewController.h"
#define ROW 5
#define COLUMN 3
#define IMAGE_COUNT ROW*COLUMN
#define WIDTH 100//图片宽
#define HEIGHT WIDTH//图片高
@interface ViewController ()
{
NSMutableArray *_imageViews;
NSArray *arrayImage;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
arrayImage = @[
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://hiphotos.baidu.com/90008com/pic/item/fdaef1ea2eea7ff3d539c904.jpeg",
@"http://p7.qhimg.com/t01308022902bb3cc15.jpg",
@"http://www.33lc.com/article/UploadPic/2012-8/2012815167420064.jpg",
@"http://d.3987.com/jmfghjgqbz.120925/004.jpg",
@"http://img.bbs.duba.net/month_1011/1011020907c8b129640ca5a7e7.jpg",
@"http://www.deskcar.com/desktop/car/201337162241/6.jpg",
@"http://pic11.nipic.com/20101117/778850_171649021175_2.jpg",
@"http://kuoo8.com/wall_up/hsf2288/200911/200911031144096643.jpg",
@"http://pic.4j4j.cn/upload/pic/20130305/6399c64adb.jpg",
@"http://www.deskcar.com/desktop/car/2005/2007121201442/10.jpg"
];
[self layout];
}
- (void)layout
{
_imageViews = [NSMutableArray array];
for (int r = 0; r < COLUMN; r++) {
for (int c = 0; c < ROW; c++) {
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(18.75 + r * 118.75, 20 + c * 118.75, WIDTH, HEIGHT)];
imageView.backgroundColor = [UIColor colorWithRed:0 green:1 blue:1 alpha:0.8];
[self.view addSubview:imageView];
[_imageViews addObject:imageView];
}
}
UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(50, 620,275,30)];
[button setTitle:@"加载图片" forState:UIControlStateNormal];
[button setTitleColor:[UIColor brownColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(useMultiThread) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)updateImage : (NSArray *)arr
{
UIImage *image = [UIImage imageWithData:arr[0]];
UIImageView *imageView = _imageViews[[arr[1] intValue]];
imageView.image = image;
}
- (void)loadImage : (NSNumber *)index{
// //优先下载
if (![index isEqual:@14]) {
//若是当前进程不是最后一个，就休眠2秒
[NSThread sleepForTimeInterval:3];
}
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:arrayImage[[index intValue]]]];
NSArray *arrData = @[data,index];
[self performSelectorOnMainThread:@selector(updateImage:) withObject:arrData waitUntilDone:YES];
}
- (void)useMultiThread
{
for (int i = 0; i < IMAGE_COUNT; i++) {
NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];
thread.name = [NSString stringWithFormat:@"个人线程：%d",i];
[thread start];//启动
}
}
#pragma mark 改变线程优先级
//提升优先级是提升他被加载的概率，可是未必就第一个加载。1.其余进程是先启动的2.网络情况咱们没办法修改
//-(void)useMultiThrea{
// NSMutableArray *array = [NSMutableArray array];
// for (int i = 0; i < IMAGE_COUNT; i++) {
// NSThread *thread1 = [[NSThread alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];
// //设置进程优先级（范围0-1）
// if (i == IMAGE_COUNT-1) {
// thread1.threadPriority = 1.0;
// }else{
// thread1.threadPriority = 0;
// }
// [array addObject:thread1];
// }
// for (int i = 0; i<IMAGE_COUNT; i++) {
// NSThread *thread2 = array[i];
// [thread2 start];
// }
//}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
TWO-----------------------------------------------------------------
#import "ViewController.h"
#define ROW 5
#define COLUMN 3
#define IMAGE_COUNT ROW*COLUMN
#define WIDTH 100//图片宽
#define HEIGHT WIDTH//图片高
@interface ViewController ()
{
NSMutableArray *_imageViews;
NSArray *arrayImage;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
arrayImage = @[
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://hiphotos.baidu.com/90008com/pic/item/fdaef1ea2eea7ff3d539c904.jpeg",
@"http://p7.qhimg.com/t01308022902bb3cc15.jpg",
@"http://www.33lc.com/article/UploadPic/2012-8/2012815167420064.jpg",
@"http://d.3987.com/jmfghjgqbz.120925/004.jpg",
@"http://img.bbs.duba.net/month_1011/1011020907c8b129640ca5a7e7.jpg",
@"http://www.deskcar.com/desktop/car/201337162241/6.jpg",
@"http://pic11.nipic.com/20101117/778850_171649021175_2.jpg",
@"http://kuoo8.com/wall_up/hsf2288/200911/200911031144096643.jpg",
@"http://pic.4j4j.cn/upload/pic/20130305/6399c64adb.jpg",
@"http://www.deskcar.com/desktop/car/2005/2007121201442/10.jpg"
];
[self layout];
}
- (void)layout
{
_imageViews = [NSMutableArray array];
for (int r = 0; r < COLUMN; r++) {
for (int c = 0; c < ROW; c++) {
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(18.75 + r * 118.75, 20 + c * 118.75, WIDTH, HEIGHT)];
imageView.backgroundColor = [UIColor colorWithRed:0 green:1 blue:1 alpha:0.8];
[self.view addSubview:imageView];
[_imageViews addObject:imageView];
}
}
UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(50, 620,275,30)];
[button setTitle:@"加载图片" forState:UIControlStateNormal];
[button setTitleColor:[UIColor brownColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(useMultiThread) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)updateImage : (NSArray *)arr
{
UIImage *image = [UIImage imageWithData:arr[0]];
UIImageView *imageView = _imageViews[[arr[1] intValue]];
imageView.image = image;
}
- (void)loadImage : (NSNumber *)index{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:arrayImage[[index intValue]]]];
NSArray *arrData = @[data,index];
//更新UI界面，调用主线程队列
[[NSOperationQueue mainQueue]addOperationWithBlock:^{
[self updateImage:arrData];
}];
}
-(void)useMultiThread{
//1.建立一个操做队列
NSOperationQueue *operationQueue = [[NSOperationQueue alloc]init];
operationQueue.maxConcurrentOperationCount = 5;//设置最大并发线程数
//2.向队列添加操做
// for (int i = 0; i < IMAGE_COUNT; i++) {
//方法1:建立操做块，添加到队列
// NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
// [self loadImage:[NSNumber numberWithInt:i]];
// }];
// //向操做队列 添加 操做
// [operationQueue addOperation:blockOperation];
//方法2 祷文Invocation
// NSInvocationOperation *invocationOpe = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];
// [operationQueue addOperation:invocationOpe];
//方法3:控制线程的执行顺序
NSBlockOperation *lastOpe = [NSBlockOperation blockOperationWithBlock:^{
[self loadImage:@(IMAGE_COUNT-1)];
}];
for (int j = 0; j < IMAGE_COUNT-1; j++) {
NSBlockOperation *normalOpe = [NSBlockOperation blockOperationWithBlock:^{
[self loadImage:[NSNumber numberWithInt:j]];
}];
//设置依赖操做(普通依赖最后的)
[normalOpe addDependency:lastOpe];
[operationQueue addOperation:normalOpe];
}
[operationQueue addOperation:lastOpe];
// }
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
THREE---------------------------------------------------------------------
#import "ViewController.h"
@interface ViewController ()
{
UIImageView *_imageView;
NSMutableArray *_imageArray;
NSArray *arrayImage;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
arrayImage = @[
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://pic19.nipic.com/20120310/8061225_093309101000_2.jpg",
@"http://hiphotos.baidu.com/90008com/pic/item/fdaef1ea2eea7ff3d539c904.jpeg",
@"http://p7.qhimg.com/t01308022902bb3cc15.jpg",
@"http://www.33lc.com/article/UploadPic/2012-8/2012815167420064.jpg",
@"http://d.3987.com/jmfghjgqbz.120925/004.jpg",
@"http://img.bbs.duba.net/month_1011/1011020907c8b129640ca5a7e7.jpg",
@"http://www.deskcar.com/desktop/car/201337162241/6.jpg",
@"http://pic11.nipic.com/20101117/778850_171649021175_2.jpg",
@"http://kuoo8.com/wall_up/hsf2288/200911/200911031144096643.jpg",
@"http://pic.4j4j.cn/upload/pic/20130305/6399c64adb.jpg",
@"http://www.deskcar.com/desktop/car/2005/2007121201442/10.jpg"
];
[self layout];
[self GCDdemoRun];
}
-(void)layout{
_imageArray = [NSMutableArray array];
for (int i = 0 ; i<5; i++) {
for (int j = 0; j<3; j++) {
_imageView = [[UIImageView alloc]initWithFrame:CGRectMake(18.75 + j * 118.75, 20 + i * 118.75, 100, 100)];
_imageView.backgroundColor = [UIColor colorWithRed:0 green:1 blue:1 alpha:0.8];
[self.view addSubview:_imageView];
[_imageArray addObject:_imageView];
}
}
}
//-(void)GCDdemoRun{
// //队列组
// dispatch_group_t groupQueue = dispatch_group_create();
// //组1开始异步执行任务
// dispatch_group_async(groupQueue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// NSLog(@"组1任务完成");
// });
// //组2开始异步执行任务
// dispatch_group_async(groupQueue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// NSLog(@"组2任务完成");
// });
// //监听组队列任务完成
// dispatch_group_notify(groupQueue, dispatch_get_main_queue(), ^{
// NSLog(@"组队列任务所有结束");
// });
//}
//锁机制
//IOS中提供经常使用的两种方法
//1.NSLock
//2.@synchronized
//-(void)GCDdemoRun{
// //全局队列（可开启多个线程）
// //参数1:线程优先级（high，default，low）
// //参数2:标记参数，目前没有用，通常写0；
// dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
// //建立线程执行任务
// for (int i = 0; i < 15; i++) {
// //异步执行队列任务
// dispatch_async(globalQueue, ^{
// [self loadImage:i];
// });
// }
//}
-(void)GCDdemoRun{
//串行队列
//参数1:队列名称 参数2：队列类型
dispatch_queue_t serialQueue = dispatch_queue_create("mySerialQueue", DISPATCH_QUEUE_SERIAL);
//建立1个线程(执行15个任务)
for (int i = 0; i < 15; i++) {
//异步执行队列任务
//因为是串行队列，因此不会建立新的线程
dispatch_async(serialQueue, ^{
[self loadImage:i];
sleep(1);//休眠1秒
});
}
}
-(void)loadImage:(int)index{
//打印当前操做线程
NSLog(@"%@",[NSThread currentThread]);
//获取图片数据
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:arrayImage[index]]];
//获取主队列，更新UI
dispatch_queue_t mainQueue = dispatch_get_main_queue();
//同步执行
//当前线程正在执行任务时，不会开启新线程
dispatch_sync(mainQueue, ^{
UIImage *image = [UIImage imageWithData:data];
UIImageView *imageView = _imageArray[index];
imageView.image = image;
});
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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