RunLoop启动方法

快来打我* 2022-05-31 04:37 156阅读 0赞

- (void)run; // 默认模式
    - (void)runUntilDate:(NSDate *)limitDate;
    - (BOOL)runMode:(NSRunLoopMode)mode beforeDate:(NSDate *)limitDate;

第一种会一直运行下去，并且一直在NSDefaultRunLoopMode模式下，重复调用runMode:beforeDate:方法。

第二种会在超时时间之前一直在NSDefaultRunLoopMode模式下调用runMode:beforeDate:方法。

第三种则会在超时时间到达或者第一个inputsource被处理前一直调用runMode:beforeDate:方法。

可以通过NSRunLoop的分类查看

- (void)viewDidLoad {
        [super viewDidLoad];
        _thread = [[NSThread alloc] initWithTarget:self selector:@selector(createRunLoopInNewThread) object:nil];
        [_thread setName:@"RunLoopDemo"];
        [_thread start];
    
    }
    
    
    
    - (void)createRunLoopInNewThread {
        _theRL = [NSRunLoop currentRunLoop];
        _port = (NSMachPort *)[NSMachPort port];
        // 添加一个端口作为输入源
        [_theRL addPort:_port forMode:NSDefaultRunLoopMode];
        
        
        [_theRL run];
    
    }

NSRunLoop+Hook.h

#import <Foundation/Foundation.h>
    
    @interface NSRunLoop (Hook)
    
    @end

NSRunLoop+Hook.m

#import "NSRunLoop+Hook.h"
    #import <objc/runtime.h>
    @implementation NSRunLoop (Hook)
    
    + (void)load {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            [self _swizzleImpWithOrigin:@selector(runMode:beforeDate:) swizzle:@selector(xd_runMode:beforeDate:)];
        });
    }
    
    + (void)_swizzleImpWithOrigin:(SEL)originSelector swizzle:(SEL)swizzleSelector {
    
        Class _class = [self class];
        Method originMethod = class_getInstanceMethod(_class, originSelector);
        Method swizzleMethod = class_getInstanceMethod(_class, swizzleSelector);
    
        IMP originIMP = method_getImplementation(originMethod);
        IMP swizzleIMP = method_getImplementation(swizzleMethod);
    
        BOOL add = class_addMethod(_class, originSelector, swizzleIMP, method_getTypeEncoding(swizzleMethod));
    
        if (add) {
            class_addMethod(_class, swizzleSelector, originIMP, method_getTypeEncoding(originMethod));
        } else {
            method_exchangeImplementations(originMethod, swizzleMethod);
        }
    }
    
    - (BOOL)xd_runMode:(NSRunLoopMode)mode beforeDate:(NSDate *)limitDate {
    
        NSThread *thread = [NSThread currentThread];
    
        // 这里我们只对自己创建的线程runloop的`runMode:beforeDate:`方法进行修改.
        if ([thread.name isEqualToString:@"RunLoopDemo"]) {
            NSLog(@"RunLoopDemo线程 ");
            return YES; //如果这里返回`NO`, runloop会立刻退出, 故要返回`YES`进行验证.
        }
    
        NSLog(@"runloop+hook: 其他可能未知的线程%@ ", thread.name);
        return [self xd_runMode:mode beforeDate:limitDate];
    }
    
    @end