button上圖片在上蠢莺，文字在下并且居中顯示：
-(void)setButtonContentCenter:(UIButton *) btn{
? ? CGSizeimgViewSize,titleSize,btnSize;
? ? UIEdgeInsetsimageViewEdge,titleEdge;
? ? CGFloatheightSpace =5.0f;
? ? //設(shè)置按鈕內(nèi)邊距
? ? imgViewSize = btn.imageView.bounds.size;
? ? titleSize = btn.titleLabel.bounds.size;
? ? btnSize = btn.bounds.size;
? ? imageViewEdge =UIEdgeInsetsMake(heightSpace,0.0, btnSize.height-imgViewSize.height- heightSpace, - titleSize.width);
? ? [btnsetImageEdgeInsets:imageViewEdge];
? ? titleEdge =UIEdgeInsetsMake(imgViewSize.height+heightSpace+3, - imgViewSize.width,0.0,0.0);
? ? [btnsetTitleEdgeInsets:titleEdge];
}
