2016.8.31

//小數四舍五入

// 如: 100.178 = 100.18 | 100.123 = 100.12

- (NSString*)roundingOffwithFormat:(NSString*)format? floatNum:(float)num {

NSNumberFormatter*numberFormatter = [[NSNumberFormatteralloc]init];

[numberFormattersetPositiveFormat:format];

return[numberFormatterstringFromNumber:[NSNumbernumberWithFloat:num]];

}

// 保留小數 如果0.00改成%.2f 結果就會錯

self.backMoneyLab.text= [selfroundingOffwithFormat:@"0.00"floatNum:backMoney];