[英]Getting “unrecognized selector sent to instance” For UIView
我试图将我的UIView类的实现强制转换为我的视图控制器。 但是,当尝试为我的类调用方法时,它会抛出“无法识别的选择器发送到实例”。
这是我在头文件中所做的事情:
#import <UIKit/UIKit.h>
@interface GameViewController : UIViewController{
NSTimer *gameLoop;
}
- (IBAction)quitGame:(id)sender;
- (IBAction)rotateLeft:(id)sender;
- (IBAction)rotateRight:(id)sender;
- (IBAction)thrust:(id)sender;
@end
typedef enum { NOTREADY, READY, RUNNING, WON, LOST, PAUSED } GameState;
typedef enum { EASY, MEDIUM, HARD } GameDifficulty;
typedef enum { THRUSTERS_ON, THRUSTERS_OFF } ThrusterState;
// Declaration of other constants used to manage the physics
static const int FUEL_INITIAL = 200;
static const int FUEL_MAX = 200;
static const int FUEL_BURN = 10;
static const int MAX_INIT = 30;
static const int MAX_SPEED = 120;
static const int ACCELERATION_DOWN = 35;
static const int ACCELERATION_UP = 80;
static const double GRAVITY = 9.8;
@interface GameView : UIView {
@private UIImage *plander_thrust;
@private UIImage *plander_nothrust;
@private UIImage *plander_crashed;
// Other game member variables
@private GameState gstate;
@private GameDifficulty level;
@private ThrusterState thrusters;
@private int fuel;
@private int speed_x;
@private int speed_y;
@private double rotation;
// Define our lander’s X and Y on-screen coordinates
@private int loc_x;
@private int loc_y;
}
@property (nonatomic, retain) UIImage *lander_nothrust;
// Declare our class methods
- (void) newGame;
- (void) updateLander;
- (void) rotateLeft:(id)sender;
- (void) rotateRight:(id)sender;
- (void) thrustEngine:(id)sender;
@end
现在,这是我正在使用我的.m文件:
#import "GameView.h"
@implementation GameViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
//'timerLoop' function
gameLoop = [NSTimer scheduledTimerWithTimeInterval: 0.025 target:self selector:@selector(timerLoop:) userInfo:nil repeats:YES];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void) timerLoop:(NSTimer *)timerObj {
//so this is where I am getting the error
[(GameView *)self.view updateLander];
[self.view setNeedsDisplay];
}
- (IBAction)quitGame:(id)sender {
[self dismissModalViewControllerAnimated:true];
}
- (IBAction)rotateLeft:(id)sender {
[(GameView *)self.view rotateLeft:sender];
}
- (IBAction)rotateRight:(id)sender {
[(GameView *)self.view rotateRight:sender];
}
- (IBAction)thrust:(id)sender {
[(GameView *)self.view thrustEngine:sender];
}
@end
@implementation GameView
@synthesize lander_nothrust;
-(id)initWithCoder:(NSCoder *)aDecoder{
if(self == [super initWithCoder:aDecoder]){
//initialize sprites
NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"lander" ofType:@"tiff"];
self.lander_nothrust = [UIImage new];
self.lander_nothrust = [UIImage imageWithContentsOfFile:imagePath];
[self newGame];
}
return self;
}
-(void) newGame{
gstate = READY;
level = EASY;
thrusters = THRUSTERS_OFF;
fuel = FUEL_INITIAL;
loc_x = self.frame.size.width / 2;
loc_y = self.frame.size.height / 2;
// Set the game as RUNNING
gstate = RUNNING;
}
-(void)updateLander{
}
// rotateLeft - rotate the lander left
- (void)rotateLeft:(id)sender
{
// Do Something
}
// rotateRight - rotate the lander right
- (void)rotateRight:(id)sender
{
// Do Something
}
// thrustEngine - fire the thruster on the engine
- (void)thrustEngine:(id)sender
{
// Do Something
}
-(void)drawRect:(CGRect)rect{
if(gstate != RUNNING){
return;
}
[self.lander_nothrust drawAtPoint:CGPointMake(loc_x, loc_y)];
self.backgroundColor = [UIColor redColor];
}
@end
如上所示我得到这行代码的错误:
[(GameView *)self.view updateLander];
我环顾四周,我一直听说这是因为我正在调用一个对我的对象不存在的方法,但我不确定为什么它没有看到我的对象实现。 我甚至在Identity Inspector中将UIView的自定义类设置为“GameView”作为我的类。
问题出在你的笔尖上。 您没有将视图的自定义类设置为GameView
,或者您没有将文件所有者的view
插座连接到该视图。
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