开发中常见的一类崩溃错误是遇到：unrecognized selector sent to instance 0xaxxxx…而backtrace又无法明确说明错误在哪行代码，如何快速定位BUG呢？
有时读代码一下很难找到是哪个instance出的问题，这时定制有效的DEBUG断点是最好的办法，方法如下：
在Debug菜单中选择 Breakpoints -> Create Symbolic Breakpoint…
SymbolicBreakpoint1
1
-[NSObject(NSObject) doesNotRecognizeSelector:]
SymbolicBreakpoint2
ARC and UIAlertView: unrecognized selector sent to instan...
[__NSCFConstantString size]: unrecognized selector sent t...
-[__NSArrayM enqueue:]: unrecognized selector sent to ins...
[__NSCFString size]: unrecognized selector sent to instan...
1、-[ViewController test]: unrecognized selector sent to i...
[NSNull length]: unrecognized selector sent to instance我遇...
1、UILabel copyWithZone:]: unrecognized selector sent to i...
-[NSNull count]: unrecognized selector sent to instance 0...
程序崩溃:**** unrecognized selector sent to instance 含义：表明 已向...
崩溃原因 -[UIView setImage:]: unrecognized selector sent to i...
本文标题：UNRECOGNIZED SELECTOR SENT TO IN
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