货币：字符串转换成货币格式

NSMutableString *newStr = [[NSMutableString alloc] initWithString:[NSString stringWithFormat:@"%ld",(long)_flowerNum]];

NSInteger insertPosition = newStr.length / 3;

NSInteger remaiderNum = newStr.length % 3;

NSInteger strLength = newStr.length;

if (strLength > 3) {

if (remaiderNum != 0) {

for (NSInteger i = 1; i <= insertPosition; i++) {

[newStr insertString:@"," atIndex:strLength - 3 * i];

}

}else{

for (NSInteger i = 1; i < insertPosition; i++) {

[newStr insertString:@"," atIndex:strLength - 3 * i];

}

}

}