bither-ios/Utils/UIImageExt.m
//  UIImageExt.m
//  bither-ios
//
//  Copyright 2014 http://Bither.net
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

#import "UIImageExt.h"

@implementation UIImage (UIImageExt)
- (UIImage *)scaleToSize:(CGSize)size {
    if (self.size.width * self.scale > size.width && self.size.height * self.scale > size.height) {
        if (isnan(size.width) || isnan(size.height) || size.width <= 0 || size.height <= 0) {
            return self;
        }
        UIGraphicsBeginImageContext(size);
        [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
        UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return scaledImage;
    }
    return self;
}
@end
