Test.m
创建独立的 thread:
+ (void)testThreadMain {
@autoreleasepool {
[[NSThread currentThread] setName:@"test"];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
[runLoop run];
}
}
// 独立线程
+ (NSThread *)testThread {
static NSThread *testThread = nil;
static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate, ^{
testThread = [[NSThread alloc] initWithTarget:self selector:@selector(testThreadMain) object:nil];
[testThread start];
});
return testThread;
}
线程跳转:
- (void)log {
NSLog(@"current thread: %@", [NSThread currentThread]);
}
// 线程切换，在 main thread 中调用这个方法，切换至 testThread
- (void)test {
[self performSelector:@selector(log) onThread:[[self class] testThread] withObject:nil waitUntilDone:NO];
}
main.m
循环调用:
#import <Foundation/Foundation.h>
#import "Test.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
for (int i = 0; i < 100; i++) {
[[[Test alloc] init] test];
}
[NSThread sleepForTimeInterval:100];
}
return 0;
}
结果
打印日志：
...
2016-03-25 15:22:24.270 RunLoopTest[2436:217874] current thread: <NSThread: 0x100200310>{number = 2, name = test}
2016-03-25 15:22:24.271 RunLoopTest[2436:217874] current thread: <NSThread: 0x100200310>{number = 2, name = test}
2016-03-25 15:22:24.271 RunLoopTest[2436:217874] current thread: <NSThread: 0x100200310>{number = 2, name = test}
...
