如题
UIImageView *shareImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, IMG_WIDTH*Big_Time, IMG_HEIGHT*Big_Time)];
Big_Time是3 里面的图片的宽和高我也同比放大了3倍 但是就是有一些模糊 这是为什么
这是放大图片的函数
- (UIImage *)clipImageWithScaleWithsize:(CGSize)asize
{
UIImage *newimage;
UIImage *image = self;
if (nil == image) {
newimage = nil;
}
else{
CGSize oldsize = image.size;
CGRect rect;
if (asize.width/asize.height > oldsize.width/oldsize.height) {
rect.size.width = asize.width;
rect.size.height = asize.width*oldsize.height/oldsize.width;
rect.origin.x = 0;
rect.origin.y = (asize.height - rect.size.height)/2;
}
else{
rect.size.width = asize.height*oldsize.width/oldsize.height;
rect.size.height = asize.height;
rect.origin.x = (asize.width - rect.size.width)/2;
rect.origin.y = 0;
}
UIGraphicsBeginImageContext(asize);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClipToRect(context, CGRectMake(0, 0, asize.width, asize.height));
CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background
[image drawInRect:rect];
newimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
return newimage;
}
这是将UIimageview转化成图片
+(UIImage *)imageWithView:(UIView *)view
{
UIGraphicsBeginImageContext(view.bounds.size);
CGContextRef currnetContext = UIGraphicsGetCurrentContext();
[view.layer renderInContext:currnetContext];
// 从当前context中创建一个改变大小后的图片
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
// 使当前的context出堆栈
UIGraphicsEndImageContext();
return image;
}
