我需要在滚动视图上创建一个UIImageView,激活触摸。 是一个小UiimageView 100x50是人们可以签名。
我使用相同的代码并且它可以工作,但是滚动视图却没有。 我环顾四周,但找不到相应的代码。
·H
UIImageView *drawImage;
@property (nonatomic, retain) IBOutlet UIImageView *drawImage;
的.m
@synthesize drawImage;
- (void)viewDidLoad {
[scrollView setScrollEnabled:YES];
[scrollView setContentSize:CGSizeMake(320,1540)];
if ([MFMailComposeViewController canSendMail])
button.enabled = YES;
drawImage.userInteractionEnabled = YES;
UITapGestureRecognizer *gestureRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touchesBegan:)];
gestureRec.numberOfTouchesRequired = 1;
gestureRec.numberOfTapsRequired = 1;
[drawImage addGestureRecognizer:gestureRec];
[gestureRec release];
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn addTarget:self action:@selector(printItem) forControlEvents:UIControlEventTouchDown];
btn.frame = CGRectMake(75, 0, 44, 44);
[btn setImage:[UIImage imageNamed:@"print.png"] forState:UIControlStateNormal];
[self.view addSubview:btn];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 3) {
drawImage.image = nil;
return;
}
lastPoint = [touch locationInView:drawImage];
// lastPoint.y -=20;// only if signature goes bottom of the screen
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:drawImage];
currentPoint.y -=5; // only if signature goes bottom of the screen
UIGraphicsBeginImageContext(drawImage.frame.size);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
CGContextSetLineCap(currentContext, kCGLineCapRound);
CGContextSetLineWidth(currentContext, 2.0);
CGContextSetRGBStrokeColor(currentContext, 0.0, 0.0, 0.0, 1.0);
CGContextBeginPath(currentContext);
CGContextMoveToPoint(currentContext, lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(currentContext, currentPoint.x, currentPoint.y);
CGContextStrokePath(currentContext);
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 3) {
drawImage.image = nil;
return;
}
if(!mouseSwiped) {
UIGraphicsBeginImageContext(drawImage.frame.size);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
CGContextSetLineCap(currentContext, kCGLineCapRound);
CGContextSetLineWidth(currentContext, 3.0);
CGContextSetRGBStrokeColor(currentContext, 1.0, 1.0, 2.0, 2.0);
CGContextMoveToPoint(currentContext, lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(currentContext, lastPoint.x, lastPoint.y);
CGContextStrokePath(currentContext);
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
我尝试了NSZombieEnabled,并在touchesBegan上的UITouch行上获得了一个SIGABRIT
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 3) {
drawImage.image = nil;
return;
}
lastPoint = [touch locationInView:drawImage];
// lastPoint.y -=20;// only if signature goes bottom of the screen
}
和SIGABRIT,在int main(int argc,char * argv [])行
#import <UIKit/UIKit.h>
int main(int argc, char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];
return retVal;
}
我仍然像以前一样得到错误:
2011-05-10 22:14:22.509 anamnesiprova[90427:207] -[UITapGestureRecognizer anyObject]: unrecognized selector sent to instance 0x6bd5ba0
2011-05-10 22:14:22.512 anamnesiprova[90427:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITapGestureRecognizer anyObject]: unrecognized selector sent to instance 0x6bd5ba0'
答案 0 :(得分:0)
我认为你必须将你的UIImageView的userInteractionEnabled
设置为YES。
另一个想法是在你的imageView中添加一个GestureRecognizer,开头就是一个简单的:
UITapGestureRecognizer *gestureRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(myMethodToBeCalled)];
gestureRec.numberOfTouchesRequired = 1;
gestureRec.numberOfTapsRequired = 1;
[myImageView addGestureRecognizer:gestureRec];
[gestureRec release];