试试这个方法来调整图像大小
-(UIImage *)resizeImage:(UIImage *)image width:(int)wdth height:(int)hght{
int w = image.size.width;
int h = image.size.height;
CGImageRef imageRef = [image CGImage];
int width, height;
int destWidth = wdth;
int destHeight = hght;
if(w > h){
width = destWidth;
height = h*destWidth/w;
}
else {
height = destHeight;
width = w*destHeight/h;
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef bitmap;
bitmap = CGBitmapContextCreate(NULL, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst);
if (image.imageOrientation == UIImageOrientationLeft) {
CGContextRotateCTM (bitmap, M_PI/2);
CGContextTranslateCTM (bitmap, 0, -height);
} else if (image.imageOrientation == UIImageOrientationRight) {
CGContextRotateCTM (bitmap, -M_PI/2);
CGContextTranslateCTM (bitmap, -width, 0);
}
else if (image.imageOrientation == UIImageOrientationUp) {
} else if (image.imageOrientation == UIImageOrientationDown) {
CGContextTranslateCTM (bitmap, width,height);
CGContextRotateCTM (bitmap, -M_PI);
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}