1.xcode运行到真机报错While reading xx.png pngcrush caught libpng
原因1. 是提示的png并不是ps导出的png，而是手动修改jpeg后缀名为png，在模拟器上不会报错，但在真机，
不识别这种所谓 的“png”图片。(随便批下美工)
原因2：这是因为png图片的问题，png图片在存储的时候有一个NOT INTERLACED/INTERLACED（无交错/交错）
的选项，因为设计师在切图的时候的存储错误，图片在XCode中就会报这个错误，但是还是会编译成功并运行，请设计师
将图片重新按无交错存储就行了。
解决方案：
用ps重新导出png就ok了
参考 http://zfanxu.iteye.com/blog/1974113
The file “XXX” couldn’t be opened because you don’t have permission to view it.
shift+command+k重新运行然后就可以了，我的是这样解决的。
2.AFNetworking报错:(415 Domain=com.alamofire.error.serialization.response Code=-1011 "Request failed: un
参考：http://blog.csdn.net/liqunzhang/article/details/70256313
3.Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] loaded the "PhoneCameraController" nib but the view outlet was not set.'
先建的controller类，后加的xib，没有将view与控制器建立关系。
从File's Owner向View拖线。
4、在升级到Xcode9 遇到以下错误：Compiling IB documents for earlier than iOS 7 is no longer supported
将Development Target调整到iOS7以后到版本：
5、-(void)scrollViewDidZoom:(UIScrollView *)scrollView不执行
做scrollView缩放功能时代理设置了，但是self.scrollView.minimumZoomScale = minZoomScale;
self.scrollView.maximumZoomScale = 1.0f未设置
6、iOS经典错误Undefined symbols for architecture XXX:
原因：编译项目时，因为静态库没有链接进工程，所以静态库就不会参与编译，而项目某些文件（.m文件）又引用（或者说依赖）了静态库，所以自然会报错，而报的错就是经典的 Undefined symbols for architecture XXX这一类的错误。
解决方案：下次遇到这类问题，我们只需要在Linked Frameworks and Libraries 中添加指定的静态库即可！
参考：http://www.cocoachina.com/ios/20170221/18737.html
7、升级完xcode后报错：
error: failed to remove /Users/ ....../xxx.app/Info.plist: “Info.plist” couldn’t be removed.
Command + shift + K就可以了
8、使用百度地图SDK报错：[BMKSearchReverseGeoCodeModel bmk_objectWithKeyValues:]: unrecognized selector sent to class
项目缺少配置
添加官方说明的库及工程配置。
9、百度地图manager start failed : info.plist 中必须添加 Bundle display name
用source code方式打开info.plist并添加：
CFBundleDisplayName
项目名
10、手势与tableview点击事件冲突：
1、父类事件设置代理
UIGestureRecognizer *tapGesture 。。。
tapGesture.delegate = self;
2、覆盖方法
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {
return NO;
}
return YES;
}
就可以了
11、
CGImageRef imgRef = self.image.CGImage;
CGFloat w = CGImageGetWidth(imgRef);
CGFloat h = CGImageGetHeight(imgRef);
UIGraphicsBeginImageContextWithOptions(self.image.size, NO, 0);
[self.image drawInRect:CGRectMake(0, 0, w, h)];
绘图时报如下错：
CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SH
最后原因是self.image为nil。
12、Permission to debug xxxx(app) was denied. The app must be signed with a development identity (e.g. iOS Developer).
在用Instruments 测试程序的时候报这样的错。
这里修改Profile 为debug模式解决。
13、 -[__NSCFConstantString size]: unrecognized selector sent to instance 0x10213a758
原因：因为使用时候的类型和初始化的对象类型不匹配造成的。
粗心将字符串直接赋值给了image[self.bottomBtn setImage:@"image" forState:UIControlStateNormal];
改：[self.bottomBtn setImage:[UIImage imageNamed:@"image"] forState:UIControlStateNormal];
14、导入opencv库后报错
Showing All Messages
"std::__1::num_get > >::id", referenced from:
std::__1::basic_istream >::operator>>(unsigned long&) in opencv2(persistence.o)
"std::__1::basic_string, std::__1::allocator >::reserve(unsigned long)", referenced from:
base64::make_base64_header(char const*) in opencv2(persistence.o)
icvXMLParseBase64(CvFileStorage*, char*, CvFileNode*) in opencv2(persistence.o)
icvYMLParseBase64(CvFileStorage*, char*, int, CvFileNode*) in opencv2(persistence.o)
icvJSONParseValue(CvFileStorage*, char*, CvFileNode*) in opencv2(persistence.o)
"std::__1::basic_string, std::__1::allocator >::rfind(char, unsigned long) const", referenced from:
_cvOpenFileStorage in opencv2(persistence.o)
"typeinfo for std::__1::ios_base", referenced from:
typeinfo for std::__1::basic_ios > in opencv2(ocl.o)
"std::__1::locale::locale()", referenced from:
......
添加libc++.tbd解决。
15.运行腾讯云demo报错
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_TXSpeed", referenced from:
objc-class-ref in VideoEditViewController.o
"_OBJC_CLASS_$_TXVideoEditer", referenced from:
objc-class-ref in VideoEditViewController.o
"_OBJC_CLASS_$_TXPreviewParam", referenced from:
objc-class-ref in VideoEditPrevController.o
objc-class-ref in VideoEditViewController.o
.....
objc-class-ref in ZFPlayerView.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
原因
链接的framework不见了，工程本地目录里还在，重新添加framework链接
