iOS开发常见问题(二)

1、Xcode升级到7.0后新建项目报错，提示：

Undefined symbols for architecture i386:
"_sqlite3_bind_blob", referenced from:
-[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o
"_sqlite3_bind_double", referenced from:
-[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o
"_sqlite3_bind_int", referenced from:
-[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o
"_sqlite3_bind_int64", referenced from:

....

这个问题是libsqlite3.0.dylib没有找到造成的，而在Xcode7.0之后在iOS9sdk中是没有libsqlite3.0.dylib,应当替换成libsqlite3.0.tbd

2、Collection <CALayerArray: 0x1474dcf0> was mutated while being enumerate

可变数组在枚举时被改动。

3、containsString方法在iOS7系统下不能使用，报错信息__NSCFString containsString:]: unrecognized selector sent to instance 0x7f876b79e160

解决方法：

NSRange range = [str rangeOfString:@"string"];

if(range.length > 0){

//字符串str中存在字符“string”

}