我想做什么：
我想制作一个根据它的当前状态放大或缩小的按钮，该状态由它的大小决定。
当按钮大并且我按下它时，它会变小。当按钮很小并且我按下它时，它会变大。
该按钮必须包含 QR 码的图像，并且随后可由 QR 阅读器扫描。
我的问题：
是不是图像大时模糊。如果我将图像放在 ImageView 而不是按钮中，情况并非如此。
效果最好在这里描述：http: //imgur.com/a/h3rJg#0
编码：
按钮/图像声明
UIImage* image = [QREncoder encode:user];
// declare image - QREncoder can be found on github
UIImage *strechedBackground = [image stretchableImageWithLeftCapWidth:220 topCapHeight:220];
UIImageView* imageView = [[UIImageView alloc] initWithImage:image];
CGFloat qrSize = self.view.bounds.size.width - kPadding * 2;
CGRect largeFrame = CGRectMake(kPadding, (self.view.bounds.size.height - qrSize) / 2,
qrSize, qrSize);
imageView.frame = largeFrame;
[imageView layer].magnificationFilter = kCAFilterNearest;
//[self.view addSubview:imageView];
// add qr button to the view
self.qrButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.qrButton.frame = largeFrame;
[self.qrButton setBackgroundImage:image forState:UIControlStateNormal];
[self.qrButton addTarget:self
action:@selector(aMethod)
forControlEvents:UIControlEventTouchDown];
self.qrButton.contentMode = UIViewContentModeCenter;
[self.view addSubview:self.qrButton];
按钮/图像缩放功能
- (void)aMethod{
// some variables concerned with button sizes and dimensions
CGFloat qrSize = self.view.bounds.size.width - kPadding * 2;
CGRect largeFrame = CGRectMake(kPadding, (self.view.bounds.size.height - qrSize) / 2,
qrSize, qrSize);
CGFloat smallButtonWidth = 33.0;
CGFloat smallButtonHeight = 33.0;
CGFloat largeButtonWidth = 264.0;
CGFloat largeButtonHeight = 264.0;
CGRect smallFrame = CGRectMake(self.view.frame.size.width - smallButtonWidth - kPadding/2, self.view.frame.size.height - smallButtonHeight - kPadding/2, smallButtonWidth, smallButtonHeight);
// a boolean ivar indicates the size of the button
if (!self.qrButtonIsBig){
NSLog(@"Button was Big");
// animate the view...
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
//self.qrButton.transform = CGAffineTransformMakeScale(3, 3);
// resting positon after animation
self.qrButton.frame = smallFrame;
}
completion:nil];
NSLog(@"Button is now Small");
}else{
NSLog(@"Button was Small");
// animate the view...
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
self.qrButton.transform = CGAffineTransformIdentity;
// resting positon after animation, bottom left with 20 px margin
self.qrButton.frame = largeFrame;
}
completion:nil];
NSLog(@"Button is now Big");
}
self.qrButtonIsBig = !self.qrButtonIsBig;
}