/*
+(NSDictionary*)SeparateImage:(UIImage*)image ByX:(int)x andY:(int)y cacheQuality:(float)quality;
方法说明：
NSDictionary*：返回字典，UIImageView格式，不仅含有 Image 还含有 Rect。
image: 图片资源，要求为UIImage格式。x: y:分别表示要切成几行和列，最小值为1。
quality：处理后保存的小图片的质量。（0，1］有效，小于或为0不保存，大于1时会被强强制为1。
切割后的小图片保存位置为 Homedirectory， 可以通过 nslog(@"%@",NSHomedirectory()); 查出。
用途：
适合图片处理应用里为图片添加百叶窗效果，或者拼图游戏里...
*/
+(NSDictionary*)SeparateImage:(UIImage*)image ByX:(int)x andY:(int)y cacheQuality:(float)quality
{
//kill errors
if (x<1) {
NSLog(@"illegal x!");
return nil;
}else if (y<1) {
NSLog(@"illegal y!");
return nil;
}
if (![image isKindOfClass:[UIImage class]]) {
NSLog(@"illegal image format!");
return nil;
}
//attributes of element
float _xstep=image.size.width*1.0/(y+1);
float _ystep=image.size.height*1.0/(x+1);
NSMutableDictionary*_mutableDictionary=[[[NSMutableDictionary alloc]initWithCapacity:1]autorelease];
//NSArray*_array=[imageName componentsSeparatedByString:@"."];
//NSString*prefixName=[_array objectAtIndex:0];
NSString*prefixName=@"win";
//snap in context and create element image view
for (int i=0; i<x; i++)
{
for (int j=0; j<y; j++)
{
CGRect rect=CGRectMake(_xstep*j, _ystep*i, _xstep, _ystep);
CGImageRef imageRef=CGImageCreateWithImageInRect([image CGImage],rect);
UIImage* elementImage=[UIImage imageWithCGImage:imageRef];
UIImageView*_imageView=[[UIImageView alloc] initWithImage:elementImage];
_imageView.frame=rect;
NSString*_imageString=[NSString stringWithFormat:@"%@_%d_%d.jpg",prefixName,i,j];
[_mutableDictionary setObject:_imageView forKey:_imageString];
//CFRelease(imageRef);
if (quality<=0)
{
continue;
}
quality=(quality>1)?1:quality;
NSString*_imagePath=[NSHomeDirectory() stringByAppendingPathComponent:_imageString];
NSData* _imageData=UIImageJPEGRepresentation(elementImage, quality);
[_imageData writeToFile:_imagePath atomically:NO];
}
}
//return dictionary including image views
NSDictionary*_dictionary=_mutableDictionary;
return _dictionary;
}