//
//  UILabel+EasyExtend.m
//  leway
//
//  Created by 朱潮 on 14-6-6.
//  Copyright (c) 2014年 zhuchao. All rights reserved.
//

#import "UILabel+EasyExtend.h"

@implementation UILabel (EasyExtend)

//ios6 later
-(CGSize)autoSize{
    return [self.text boundingRectWithSize:self.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;
}


/**
 *  fixes issues with embedding a `UILabel` in a `UIScrollScrollView`.
 *  @see http://www.raywenderlich.com/73602/dynamic-table-view-cell-height-auto-layout for examples and in-depth discussion on why this is needed.
 *
 *  @discussion Setting the label's `bounds` will update the `preferredMaxLayoutWidth`.
 */

-(instancetype)init{
    self = [super init];
    if (self) {
        self.preferredMaxLayoutWidth = 300;
        @weakify(self);
        [[RACObserve(self,bounds)
         filter:^BOOL(id value) {
             @strongify(self);
             return self.bounds.size.width != self.preferredMaxLayoutWidth;
         }]
        subscribeNext:^(id x) {
            @strongify(self);
            self.preferredMaxLayoutWidth = self.bounds.size.width;
            [self setNeedsUpdateConstraints];
        }];
    }
    return self;
}
@end