iOS-产品要的UIView

1、Button上面图片，下面文字

attentionBtn.frame = .init(x: kScreenW-15.0-40.0, y: 30.0, width: 40.0, height: 46.0)
        attentionBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignment.center //先调整图片文字水平居中，再调整图片文字的位置
        attentionBtn.titleEdgeInsets = UIEdgeInsetsMake(attentionBtn.imageView!.frame.size.height, -attentionBtn.imageView!.frame.size.width, 0.0, 0.0)
        attentionBtn.imageEdgeInsets = UIEdgeInsetsMake(-attentionBtn.titleLabel!.frame.size.height, 0.0,0.0, -attentionBtn.titleLabel!.bounds.size.width)
        attentionBtn.titleLabel!.font = UIFont.systemFont(ofSize: 12)
        contentView.addSubview(attentionBtn)

2、tabbar中间的那个是整个图片，无需自定义，简单实现

if([childVc isKindOfClass:NSClassFromString(@"YXFLViewController")]){
          //就是这句，调整图片的位置，跟button差不多
           childVc.tabBarItem.imageInsets=UIEdgeInsetsMake(6, 0, -6, 0);

}

效果图：

效果图.png

3、设置UITextField中placeholder的颜色，方法有三种，第三种重写TextField的drawRect麻烦，就说前面两个。

方法一：利用富文本字符串
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"请输入占位文字" attributes:
    @{NSForegroundColorAttributeName:[UIColor redColor],
                 NSFontAttributeName:textField.font
         }];
    textField.attributedPlaceholder = attrString;
方法二：KVC
 [textField1 setValue:[UIColor greenColor] forKeyPath:@"_placeholderLabel.textColor"];