好吧，我想我错过了一些重要的东西，我似乎找不到答案。我发布了所有代码，因为它非常小。
有人可以告诉我我做错了什么吗？很长一段时间以来，我一直在研究这个一个又一个的例子，但我所做的似乎没有任何效果。
当我创建应用程序时，我使用任何一个框架给我一个 UIViewController。我在控制器上放了一个视图。我创建变量以链接到控制器。当我尝试将笔尖中的 UIView 连接到 UIView 时，编译器可以接受，但它也坚持要连接到“视图”，否则应用程序崩溃。如果这是问题，我不会感到惊讶，但如果是，我不知道如何解决它。
这是代码：
DotsieAppDelegate.h：
#import <UIKit/UIKit.h>
@class DotsieViewController;
@interface DotsieAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
DotsieViewController *viewController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet DotsieViewController *viewController;
@end
DotsieAppDelegate.m
#import "DotsieAppDelegate.h"
#import "DotsieViewController.h"
@implementation DotsieAppDelegate
@synthesize window;
@synthesize viewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
@end
DotsieViewController.h
#import <UIKit/UIKit.h>
@interface DotsieViewController : UIViewController {
UIView *dotsieView;
}
@property (nonatomic, retain) IBOutlet UIView *dotsieView;
@end
DotsieViewController.m
#import "DotsieViewController.h"
@implementation DotsieViewController
@synthesize dotsieView;
-(void)drawRect:(CGRect)rect {
NSLog(@"here");
CGRect currentRect = CGRectMake(50,50,20,20);
UIColor *currentColor = [UIColor redColor];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2.0);
CGContextSetStrokeColorWithColor(context, currentColor.CGColor);
CGContextSetFillColorWithColor(context, currentColor.CGColor);
CGContextAddEllipseInRect(context, currentRect);
CGContextDrawPath(context, kCGPathFillStroke);
// [self.view setNeedsDisplay];
}
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
}
[self.view setNeedsDisplay];
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.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
