Variable is not assignable (missing__block type specifier)
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异常
原因:缺少一个关键字双下划线block
解决方法:为block加上双下划线
当在block内部使用block外部定义的局部变量时,如果变量没有被__block修饰,则在block内部是readonly(只读的),
不能对他修改,如果想修改,变量前必须要有__block修饰
__block的作用告诉编译器,编译时在block内部不要把外部变量当做常量使用,还是要当做变量使用.
如果再block中访问全局变量,就不需要__block修饰.
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