Question

我目前正在设置我的监视工具包，使用以下内容将数据从源传递到目标：

来源

- (IBAction)changeRep {
NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"rep", @"button", nil];
[self presentControllerWithName:@"KeyPadInterfaceController" context:dictionary];

}

目标

- (void)awakeWithContext:(id)context {
[super awakeWithContext:context];


_parent = [context valueForKey:@"button"];



}

我尝试使用以下内容从目标到源视图获取数据，但源视图中的dataFromKeyPad未被调用。

Source.h

@interface WorkoutDetailInterfaceController : WKInterfaceController <KeyPadInterfaceControllerDelegate>{

Source.m

- (void)dataFromKeyPad:(NSDictionary *)data {
if ([data objectForKey:@"rep"]){
    _repNum = [data valueForKey:@"rep"];
    NSString *repTitle = [NSString stringWithFormat:NSLocalizedString(@"%@ reps", "Number of Reps"), _repNum];
    [self.reps setTitle:repTitle];
} else if ([data objectForKey:@"weight"]) {
    _weightNum = [data valueForKey:@"weight"];
    NSString *weightTitle = [NSString stringWithFormat:NSLocalizedString(@"%@ reps", "Number of Reps"), _weightNum];
    [self.reps setTitle:weightTitle];
}
}

Destination.h

@protocol KeyPadInterfaceControllerDelegate <NSObject>

- (void)dataFromKeyPad:(NSDictionary *)data;

@end

@property (nonatomic, weak) id<KeyPadInterfaceControllerDelegate> delegate;

Destination.m

- (IBAction)okAct{
NSDictionary *dictionary;

if ([_parent isEqualToString:@"rep"]) {
    dictionary  = [[NSDictionary alloc] initWithObjectsAndKeys:_result, @"rep", nil];
} else {
    dictionary =[[NSDictionary alloc] initWithObjectsAndKeys:_result, @"weight", nil];
}
[self.delegate dataFromKeyPad:dictionary];

[self dismissController];
}

当我按下ok按钮时，会调用okAct，它会通过包括dismissController在内的所有内容，但是[self.delegate dataFromKeyPad：dictionary];不会在源视图中触发任何内容。有什么建议？我需要Objective C中的解决方案。

Answer 1

Destination.m的self.delegate中设置了什么值？它可能包含self.delegate中的nil。

您应该按照以下步骤进行操作，以防止崩溃。

if ([self.delegate respondsToSelector:@selector(dataFromKeyPad:)])
{
    [self.delegate dataFromKeyPad:dictionary];
}

已添加（7/29）：设置self.delegate的方法

来源

- (IBAction)changeRep {
    NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:
                                @"rep", @"button",
                                self, @"delegate",
                                nil];
    [self presentControllerWithName:@"KeyPadInterfaceController" context:dictionary];
}

目标

- (void)awakeWithContext:(id)context
{
    [super awakeWithContext:context];

    // Configure interface objects here.
    if ([context isKindOfClass:[NSDictionary class]]) {
        self.delegate = [context objectForKey:@"delegate"];
    } 
}

Watchkit - 将数据传递给源控制器

1 个答案: