设置网络的tabbar图片,需要根据系统重新设置尺寸和渲染方式
[[ToolsObject image:image resizeTo:CGSizeMake(24, 24)] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
/// 根据系统修改图片尺寸
/// @param img 原图
/// @param size 新尺寸
+ (UIImage *)image:(UIImage*)img resizeTo:(CGSize)size {
CGFloat scale = [[UIScreen mainScreen]scale];
//UIGraphicsBeginImageContext(newSize);
UIGraphicsBeginImageContextWithOptions(size, NO, scale);
[img drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}