iOS给图片加标签（原创）

现在越来越多涉及到图片展示的应用都会加入标签功能，标签功能也越来越流行。想起以前做过的一个项目用到过这个功能，所以趁有时间，整理一下，仅供参考，不足之处还请多多指教。

1、标记界面

这个界面放一个UIImageView，宽高比例1：1。进入这个界面之前，图片建议是裁剪成1：1，这个比例有利于标签的展示。这个界面代码就不用展示了。

2、加标签按钮

我们项目中是将标签分为两类，文字标签和地理位置标签，基本上是相同的。按钮的布局可以参考我的，也可以自定义。

- (void)setupButton
{
   CGFloat  btnWH = 70
   CGFloat  btnMargin = 50
    UIButton *textBtn = [[UIButton alloc] initWithFrame:CGRectMake((screenW - btnWH * 2 - btnMargin) * 0.5, -btnWH, btnWH, btnWH)];
    [textBtn setImage:[UIImage imageNamed:@"addtag"] forState:UIControlStateNormal];
    [textBtn setImage:[UIImage imageNamed:@"addtag_selected"] forState:UIControlStateSelected];
    [textBtn addTarget:self action:@selector(clickText) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:textBtn];
    self.textBtn = textBtn;

    UILabel *textLabel = [[UILabel alloc] init];
    textLabel.frame = (CGRect){{textBtn.frame.origin.x, CGRectGetMaxY(textBtn.frame)}, textBtn.frame.size};
    textLabel.text = @"标签";
    textLabel.textAlignment = NSTextAlignmentCenter;
    textLabel.textColor = [UIColor whiteColor];
    textLabel.font = [UIFont systemFontOfSize:12];
    [self .view addSubview:textLabel];
    self.textLabel = textLabel;

    UIButton *locationBtn = [[UIButton alloc] initWithFrame:CGRectMake(textBtn.frame.origin.x + btnWH + btnMargin, -btnWH, btnWH, btnWH)];
    [locationBtn setImage:[UIImage imageNamed:@"addtaglocation"] forState:UIControlStateNormal];
    [locationBtn setImage:[UIImage imageNamed:@"addtaglocation_selected"] forState:UIControlStateSelected];
    [locationBtn addTarget:self action:@selector(clickLocation) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:locationBtn];
    self.locationBtn = locationBtn;

    UILabel *locationLabel = [[UILabel alloc] init];
    locationLabel.frame = (CGRect){{locationBtn.frame.origin.x, CGRectGetMaxY(locationBtn.frame)}, locationBtn.frame.size};
    locationLabel.text = @"地点";
    locationLabel.textAlignment = NSTextAlignmentCenter;
    locationLabel.textColor = [UIColor whiteColor];
    locationLabel.font = [UIFont systemFontOfSize:12];
    [self .view addSubview:locationLabel];
    self.locationLabel = locationLabel;
}