#import "ViewController.h"

#import "NSObject+DeallocBlock.h"

@interface ViewController ()

@property (strong, nonatomic) NSPort *emptyPort;

@property (strong, nonatomic) NSThread *thread;

@property (assign, nonatomic) BOOL shouldKeepRunning;

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

[self memoryTest];

NSLog(@"test");

}

#pragma --mark 内存占用测试

- (void)memoryTest {

for (int i = 0; i < 100000; ++i) {

//总结：test At: xcode8,ios 9.3.4

//1,当用CFRunLoopRun(),然后调用CFRunLoopStop，此方法是后果会输出current thread，thread dealloc，current thread，thread dealloc ...所以不会用内存问题

//2,当用 [runLoop run];,然后调用CFRunLoopStop,此方法会current thread，current thread，... 最后输出[NSThread start]: Thread creation failed with error 35.然后app卡住，然后app crash. 内存不会暴增。但是线程无法销毁

//3,当用 [runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]];,然后调用CFRunLoopStop,此方法会。[ViewController performSelector:onThread:withObject:waitUntilDone:modes:]: target thread exited while waiting for the perform' crash。是因为 [runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]]; 无法阻塞线程，所以线程很快执行完run 方法。然后线程exit，导致奔溃（在一个退出的线程，当然这个时候线程没有释放，执行方法奔溃）

NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];

[thread runAtDealloc:^{

NSLog(@"thread dealloc");

}];

[thread start];

[self performSelector:@selector(stopThread) onThread:thread withObject:nil waitUntilDone:YES];

}

NSLog(@"test over");

}

- (void)stopThread {

CFRunLoopStop(CFRunLoopGetCurrent());

NSThread *thread = [NSThread currentThread];

[thread cancel];

}

- (void)run {

@autoreleasepool {

NSLog(@"current thread = %@", [NSThread currentThread]);

NSRunLoop *runLoop = [NSRunLoop currentRunLoop];

if (!self.emptyPort) {

self.emptyPort = [NSMachPort port];

}

[runLoop addPort:self.emptyPort forMode:NSDefaultRunLoopMode];

// 下面这两种写法都不可取

[runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]];

NSLog(@"run over");

}

}

# pragma --mark runloop 启动与退出测试

- (void)runloopTest {

// 绘制按钮，点击按钮后关闭 runloop

UIButton *stopButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];

[stopButton setTitle:@"Stop Timer" forState:UIControlStateNormal];

[stopButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

[self.view addSubview:stopButton];

[stopButton addTarget:self action:@selector(stopButtonDidClicked:) forControlEvents:UIControlEventTouchUpInside];

self.thread = [[NSThread alloc] initWithTarget:self selector:@selector(singleThread) object:nil];

[self.thread start];

[self performSelector:@selector(printSomething) onThread:self.thread withObject:nil waitUntilDone:YES];

}

- (void)singleThread {

@autoreleasepool {

NSRunLoop *runLoop = [NSRunLoop currentRunLoop];

if (!self.emptyPort) {

self.emptyPort = [NSMachPort port];

}

[runLoop addPort:self.emptyPort forMode:NSDefaultRunLoopMode];

CFRunLoopRun();

}

}

- (void)printSomething {

NSLog(@"current thread = %@", [NSThread currentThread]);

[self performSelector:@selector(printSomething) withObject:nil afterDelay:1];

}

#pragma --mark 点击按钮退出

- (void)stopButtonDidClicked:(id)sender {

[self performSelector:@selector(stopRunloop) onThread:self.thread withObject:nil waitUntilDone:YES];

}

- (void)stopRunloop {

// self.shouldKeepRunning = NO;

CFRunLoopStop(CFRunLoopGetCurrent());

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}