UIButton实现左边文字,右边图片

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	//要先设置图片
 	[self.btn setImage:btnImage forState:UIControlStateNormal];
    [self.btn setImage:btnImage forState:UIControlStateHighlighted];
    _btn.titleEdgeInsets = UIEdgeInsetsMake(0, -_btn.imageView.image.size.width, 0, _btn.imageView.image.size.width);
    _btn.imageEdgeInsets = UIEdgeInsetsMake(0, _btn.titleLabel.bounds.size.width, 0, -_btn.titleLabel.size.width);