【问题标题】:How can I dynamically set the size of the imageView according to the size of the image如何根据图片大小动态设置imageView的大小
【发布时间】:2012-05-17 10:13:06
【问题描述】:
我使用 Interface Builder 来布局我的视图和图像视图。我在视图上放了一个 imageView 并将其设置为插座。问题是无论我在程序中设置什么尺寸的图片(768*1024、1024*700):
self.imageView.image = [UIImage imageNamed:self.filename];
要在屏幕上显示的大小始终是我在 Interface Builder 中设置的 imageView 的大小。如何根据图片大小动态设置imageView的大小?谢谢!
【问题讨论】:
标签:
iphone
ipad
uiimageview
【解决方案1】:
类似:
UIImageView *imageView = [[UIImageView alloc] init];
UIImage *image = [UIImage imageNamed:@"image.png"];
CGSize imageSize = [image size];
imageView.frame = CGRectMake(0, 0, imageSize.width, imageSize.height);
【解决方案2】:
UIImage *image = [UIImage imageNamed:self.filename];
CGFloat width = image.size.width;
CGFloat height = image.size.height;
self.imageView.frame = CGRectMake(x, y , width, height);
【解决方案3】:
您可以对图像进行子类化,并在每次设置新图像时执行以下覆盖:
@interface MyImageSubClass : UIImageView;
@end
@implementation MyImageSubClass
- (void)setImage:(UIImage *)image {
// Let the original UIImageView parent class do its job
[super image];
// Now set the frame according to the image size
// and keeping the original position of your image frame
if (image) {
CGRect r = self.frame;
CGSize imageSize = [image size];
self.frame = (r.origin.x, r.origin.y, imageSize.width, imageSize.height);
}
}
@end
【解决方案4】:
UIImage *buttonImage2=[UIImage imageNamed:@"blank_button_blue.png"];
oButton=[[UIButton alloc] init];
// [oButton setImage:buttonImage2 forState:UIControlStateNormal];
[oButton setFrame:CGRectMake(0, 0, buttonImage2.size.width, buttonImage2.size.height)];
【解决方案5】:
UIImage* sourceImage = [UIImage imageNamed:self.filename];;
CGRect rect;
rect.size.width = CGImageGetWidth(sourceImage.CGImage);
rect.size.height = CGImageGetHeight(sourceImage.CGImage);
[ yourimageview setframe:rect];