ios开发之UIButton左边图片，图片后面紧跟文字效果

在使用UIButton的时候，需要实现UIButton左边图片，图片后面紧跟文字效果比较麻烦，简单实现方法具体代码如下：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = RGB(235, 235, 240);
    UIButton *oneButton = [[UIButton alloc] initWithFrame:CGRectMake(0, kHeaderHeight + 8, kScreenWidth, 40)];
    [oneButton setImage:[UIImage imageNamed:@"icon_party_knowledge_rights_obligations"] forState:UIControlStateNormal];
    [oneButton setTitle:@"第一个" forState:UIControlStateNormal];
    oneButton.titleLabel.font = FONT(12);
    [oneButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [oneButton setImageEdgeInsets:UIEdgeInsetsMake(2, 8, 0, kScreenWidth - 50)];
    [oneButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, kScreenWidth - 100)];
    oneButton.backgroundColor = [UIColor whiteColor];
    [oneButton addTarget:self action:@selector(oneButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:oneButton];
    
    UIButton *twoButton = [[UIButton alloc] initWithFrame:CGRectMake(0, oneButton.maxY + 8, kScreenWidth, 40)];
    [twoButton setImage:[UIImage imageNamed:@"icon_party_knowledge_dues_collection_standard"] forState:UIControlStateNormal];
    [twoButton setTitle:@"第二个" forState:UIControlStateNormal];
    twoButton.titleLabel.font = FONT(12);
    [twoButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [twoButton setImageEdgeInsets:UIEdgeInsetsMake(2, 8, 0, kScreenWidth - 50)];
    [twoButton setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, kScreenWidth - 100)];
    twoButton.backgroundColor = [UIColor whiteColor];
    [twoButton addTarget:self action:@selector(twoButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:twoButton];
    
    //右箭头
    for (int i = 0; i < 2; i++) {
        UIImageView *rightImgView = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth - 20, kHeaderHeight + 20 + i * 48, 7, 12)];
        rightImgView.image = [UIImage imageNamed:@"icon_right"];
        [self.view addSubview:rightImgView];
    }
}

效果如下所示