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//
// ViewController.m
// RunloopAndThread
//
// Created by 张星宇 on 16/7/24.
// Copyright © 2016年 bestswifter. All rights reserved.
//
#import "ViewController.h"
#import "NSObject+DeallocBlock.h"
@interface ViewController ()
@property (strong, nonatomic) NSPort *emptyPort;
@property (strong, nonatomic) NSThread *thread;
@property (assign, nonatomic) BOOL shouldKeepRunning;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self memoryTest];
NSLog(@"test");
// [self runloopTest];
}
#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());
// [[NSRunLoop currentRunLoop] removePort:self.emptyPort forMode:NSDefaultRunLoopMode];
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 run];
[runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]];
// CFRunLoopRun();
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.shouldKeepRunning = YES;
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();
// while (_shouldKeepRunning && [runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]]);
}
}
- (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.
}
@end