解决Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.

for (QHBossCurrencyListInfoModel *model in dataArray) {
if ([model.currency isEqualToString:@"BTC"]) {
[dataArray removeObject:model];
}
}

NSMutableArray *list = [NSMutableArray arrayWithArray:dataArray];
for (QHBossCurrencyListInfoModel *model in list) {
if ([model.currency isEqualToString:@"BTC"]) {
[dataArray removeObject:model];
}
}