iOS_tips

21、iOS截图长图代码实现

+ (UIImage *)cz_longFigureForScrollView:(UIScrollView *)scrollView;
+ (UIImage *)cz_longFigureForScrollView:(UIScrollView *)scrollView {
    UIImage* image = nil;
    UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, YES, 0.0);
    
    //保存collectionView当前的偏移量
    CGPoint savedContentOffset = scrollView.contentOffset;
    CGRect saveFrame = scrollView.frame;
    
    //将collectionView的偏移量设置为(0,0)
    scrollView.contentOffset = CGPointZero;
    scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
    
    //在当前上下文中渲染出collectionView
    [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
    //截取当前上下文生成Image
    image = UIGraphicsGetImageFromCurrentImageContext();
    
    //恢复collectionView的偏移量
    scrollView.contentOffset = savedContentOffset;
    scrollView.frame = saveFrame;
    
    UIGraphicsEndImageContext();
    
    if (image != nil) {
        return image;
    }else {
        return nil;
    }
}

20、审核中可能被怀疑的问题

1.1.6 - Include false information, features, or misleading metadata.
2.3.0 - Undergo significant concept changes after approval
2.3.1 - Have hidden or undocumented features, including hidden "switches" that redirect to a gambling or lottery website
3.1.1 - Use payment mechanisms other than in-app purchase to unlock features or functionality in the app
3.2.1 - Do not come from the financial institution performing the loan services
4.3.0 - Are a duplicate of another app or are conspicuously similar to another app
5.2.1 - Were not submitted by the legal entity that owns and is responsible for offering any services provided by the app
5.2.3 - Facilitate illegal file sharing or include the ability to save, convert, or download media from third party sources without explicit authorization from those sources
5.3.4 - Do not have the necessary licensing and permissions for all the locations where the app is used

19、注册错误，不允许注册时要求用户填写身份证+姓名等敏感信息。

registererror.png

18、IPV6审核失败解决方案

ipv6error.png

// app在国内环境登录使用一切正常，审核人员登录时会提示连接失败，报500错误！并且期初错误无法复现。
// 错误复现场景，在手机设置->通用->地区与时间->将国家改为美国，成功复现连接失败错误！
// 配合后台同事调试，发现为语言包配置错误导致连接失败，没有返回任何内容。
// 参考链接：https://www.jianshu.com/p/5e06e8dd2fc4

17、IPV6审核失败解决方案

// https://blog.csdn.net/pyf_1993/article/details/73177685
// https://blog.csdn.net/wangyanchang21/article/details/73920923
// https://jiandanxinli.github.io/2016-08-06.html

16、SDWebImage在4.0之后不再支持加载gif动图，需要单独导入支持gif的库即可。

pod 'SDWebImage/GIF'
// 使用FLAnimatedImageView来代替UIImageView即可加载Gif图片

15、测试安装app时报错“This application does not support this device’s CPU type.”

// 原因：32位的Application已经被苹果淘汰,不再支持安装！
// 解决：项目中找到 Build Settings -> Architectures ,修改为 standard architectures 即可！

14、如何在用户退出时清空单例对象值，并且保证在重新登录时可以新建单例对象？

+ (void)qmx_userDealloc {
    onceToken = 0;
    _instance = nil;
}

// 1. 必须把static dispatch_once_t onceToken; 这个拿到函数体外,成为全局的. 
// 2.只有置成0,GCD才会认为它从未执行过.它默认为0.这样才能保证下次再次调用shareInstance的时候,再次创建对象.
// http://blog.csdn.net/u012847940/article/details/51422783

13、UICollectionView用法补充

// MARK: - 1.header注册方式
// 参数2 在头文件最顶部 header 或 footer
[cv registerClass:[ZXFPhotoAlbumHeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerID];
// MARK: - 2.显示header
// 需要在布局属性中设置header的size
self.headerReferenceSize = CGSizeMake(self.collectionView.width, 40);
// MARK: - 3.其他
// header类型是继承自 UICollectionReusableView
// 返回视图的方法
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
    
    ZXFPhotoAlbumHeaderView *headerV = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerID forIndexPath:indexPath];
    
    headerV.title = [NSString stringWithFormat:@"这是第 %@ 组", @(indexPath.section).description];
    
    return headerV;
}

12.iOS Crash文件分析

http://ios.jobbole.com/82120/
http://www.jianshu.com/p/62a47926334d
http://ios.jobbole.com/93238/

11.UITextField文本框的光标处理

// 会影响所有光标颜色
[[UITextField appearance] setTintColor:[UIColor blackColor]];
// 单独修改某一个光标颜色
textField.tintColor = [UIColor redColor]; 
// 不显示光标
textField.tintColor = [UIColor clearColor]; 

10.控件超出父控件范围无法响应的问题

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    
    //1. 边界情况：不能响应点击事件
    BOOL canNotResponseEvent = self.hidden || (self.alpha <= 0.01f) || (self.userInteractionEnabled == NO);
    if (canNotResponseEvent) {
        return nil;
    }
    
    //2. 最后处理 TabBarItems 凸出的部分、添加到 TabBar 上的自定义视图、点击到 TabBar 上的空白区域
    UIView *result = [super hitTest:point withEvent:event];
    if (result) {
        return result;
    }
    
    for (UIView *subview in self.subviews.reverseObjectEnumerator) {
        CGPoint subPoint = [subview convertPoint:point fromView:self];
        result = [subview hitTest:subPoint withEvent:event];
        if (result) {
            return result;
        }
    }
    return nil;
}

9.WebView问题

问题：使用UIWebView加载链接时，底部总是出现黑色的横条。
解决：设置webView的opaque属性为NO，背景颜色设置clearColor即可。

8.友盟分享集成问题

集成选择了微信、QQ、新浪微博。
问题：在弹出的分享面板中微信始终不能出现。
解决：将完整的微信SDK，切换为精简版的微信分享SDK,界面正常展示

7.字体加粗及倾斜

字体加粗
loginLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:20];
字体加粗并且倾斜
loginLabel.font = [UIFont fontWithName:@"Helvetica-BoldOblique" size:20];
// 参考网址
// http://blog.csdn.net/x1135768777/article/details/7526259

6.调整文字间距和行距
原文链接：http://www.jianshu.com/p/b7a2314e780a

#import <UIKit/UIKit.h>

@interface UILabel (ChangeLineSpaceAndWordSpace)

/**
 *  改变行间距
 */
+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space;

/**
 *  改变字间距
 */
+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space;

/**
 *  改变行间距和字间距
 */
+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace;

@end

#import "UILabel+ChangeLineSpaceAndWordSpace.h"

@implementation UILabel (ChangeLineSpaceAndWordSpace)

+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space {

    NSString *labelText = label.text;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:space];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
    label.attributedText = attributedString;
    [label sizeToFit];

}

+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space {

    NSString *labelText = label.text;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(space)}];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
    label.attributedText = attributedString;
    [label sizeToFit];

}

+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace {

    NSString *labelText = label.text;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(wordSpace)}];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:lineSpace];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
    label.attributedText = attributedString;
    [label sizeToFit];

}

@end

1.cornerstone上传默认忽略.a库文件，导致项目编译报错！

  解决：设置cornerstone的偏好设置，不要忽略.a库文件即可！
cornerstone ->preferences->Subversion->关闭 Use default global ignores -> 删除 *a选项！

cornerstone.png

2.环信推送测试收不到推送消息

  -> 1.测试证书的软件 Ease APNs Provider 可以测试生成的cer推送证书是否有问题
  -> 2.按照文档进行排查 http://www.imgeek.org/article/825307548
  
错误：上传的测试证书，环境选择成了开发环境！
解决：重新上传证书，正确选择环境即可

3.UISlider控件触发值改变事件比较频繁！

UISlider *slider = [[UISlider alloc] init];
UIImage *img = [UIImage imageNamed:@"fontchange"];
// 只在手指抬起时触发一次值改变事件
slider.continuous = NO;
[slider setThumbImage:img forState:UIControlStateNormal];

4.”A valid provisioning profile for this executable was not found“

从描述上可以看到说：对于可执行provisioning profile 没有被找到。所以网上有很多答案是说你provisioning profile没有被找到，需要重新导入之类的。
 http://blog.sina.com.cn/s/blog_71715bf8010164z5.html
但是我碰到的原因是我在Project中将Code Signing Identity中将其设置成了iPhone Develop，但是在Target中的Code Signing Identity并没有自动切换过来，我发现在Target中的Code Signing Identity还是我之前的设的iPhone Distribution,
所以看到这里就知道了，iPhone Distribution 的provisioning profile肯定是不能运行的，所以把Target中的Code Signing Identity也设置成iPhone Develop就ok了，这样一切都说的通了，唯一不合理的就是在Project切换Code Signing Identity并编译，但xCode没有自动将编译后的Target设置成和Project中的一致

5.上传错误
提交审核之前，如果需要更新构建版本，只需要更新CFBundleVersion就可以，不需要更改版本号！

屏幕快照 2017-04-28 上午9.35.38.png

解决了第一个错误就没问题了，原因是环信SDK中支持了X86_64
http://docs.easemob.com/im/300iosclientintegration/20iossdkimport

屏幕快照 2017-04-28 上午10.07.36.png