在watch OS2中使用的是WCSession来进行数据的接收与发送。
iwatch端：
在InterfaceController头文件中导入WatchConnectivity/WatchConnectivity.h，并添加WCSessionDelegate代理：
#import <WatchKit/WatchKit.h>
#import <Foundation/Foundation.h>
#import <WatchConnectivity/WatchConnectivity.h>
@interface InterfaceController : WKInterfaceController <WCSessionDelegate>
在.m文件的- (void)willActivate中添加代码：
if([WCSession isSupported]){
WCSession *session = [WCSession defaultSession];
session.delegate = self;
[session activateSession];
}
建立一个WCSession。
使用WCSession中的sendMessage发送数据:
- (IBAction)tapBtn {
WCSession *session = [WCSession defaultSession];
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:@"大神仙",@"Message", nil];
[session sendMessage:dic replyHandler:^(NSDictionary<NSString *,id> * _Nonnull replyMessage) {
NSLog(@"replay: %@", replyMessage);
} errorHandler:^(NSError * _Nonnull error) {
NSLog(@"Error: %@", error);
}];
}
通过定义一个NSDictionary作为数据对象，发送给iphone。
接收数据是通过WCSessionDelegate的代理实现：
#pragma mark WCSessionDelegate
- (void)session:(WCSession *)session activationDidCompleteWithState:(WCSessionActivationState)activationState error:(nullable NSError *)error __IOS_AVAILABLE(9.3) __WATCHOS_AVAILABLE(2.2){
}
- (void)sessionDidBecomeInactive:(WCSession *)session __IOS_AVAILABLE(9.3) __WATCHOS_UNAVAILABLE{
}
- (void)sessionDidDeactivate:(WCSession *)session __IOS_AVAILABLE(9.3) __WATCHOS_UNAVAILABLE{
}
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary<NSString *, id> *)message replyHandler:(void(^)(NSDictionary<NSString *, id> *replyMessage))replyHandler{
NSString *str = [message objectForKey:@"Message"];
[_nameLabel setText:str];
}
iOS端：
同样，在iphone端也需要导入WatchConnectivity/WatchConnectivity.h，并添加WCSessionDelegate代理。
在ViewController中导入WatchConnectivity.h，添加WCSessionDelegate。
#import <WatchConnectivity/WatchConnectivity.h>
@interface ViewController ()<WCSessionDelegate>
在ViewController.m的viewDidLoad中添加代码：
if([WCSession isSupported]){
WCSession *session = [WCSession defaultSession];
session.delegate = self;
[session activateSession];
}
同样调用sendMessage方法发送数据给iwatch
- (IBAction)tap:(UIButton *)sender {
NSString *text = _textField.text;
NSLog(@"++++%@++++", text);
[self sendText:_textField.text];
}
-(void)sendText:(NSString *)text
{
WCSession *session = [WCSession defaultSession];
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:text,@"Message", nil];
[session sendMessage:dic replyHandler:^(NSDictionary<NSString *,id> * _Nonnull replyMessage) {
NSLog(@"replay: %@", replyMessage);
} errorHandler:^(NSError * _Nonnull error) {
NSLog(@"Error: %@", error);
}];
}
和iwatch一样，需要实现相同的代理方法来接收数据，如果收到数据后需要更新UI，必须切换到主线程执行，否则会报错。
#pragma mark delegate
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary<NSString *, id> *)message replyHandler:(void(^)(NSDictionary<NSString *, id> *replyMessage))replyHandler{
dispatch_async(dispatch_get_main_queue(), ^{
//回调或者说是通知主线程刷新，
[_textField setText:[message objectForKey:@"Message"]];
});
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:_textField.text,@"Message", nil];
replyHandler(dic);
}
