@interface Target : NSObject
-@property (assign) float magnitude;
-@property (assign) BOOL running;
-@property (readonly) BOOL isContinuous;
+@property (nonatomic, assign) float magnitude;
+@property (nonatomic, assign) BOOL running;
+@property (nonatomic, readonly) BOOL isContinuous;
- (void)trigger;
- (void)untrigger;