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  • Objective-C中整数与字符串的相互转换

    2013/4/15整理:

    将整数转换成字符串 Convert Integer to NSString:
    方法一:
    int Value = 112233;
    NSString *ValueString = [NSString stringWithFormat:@"%d", Value];
    方法二:
    [[NSNumber numberWithInt: 123] stringValue];
     
    得到C风格的字符串 C String
    char *ValueasCString = (char *)[ValueString UTF8String];
     
    将字符串转换成整数或浮点数
    Convert String to Integer or float
    NSString has some useful methods:
    -(int) intValue
    -(float) floatValue
    NSString *aNumberString = @"123";
    int i = [aNumberString intValue];
     
    字符串转换为日期
    NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];//实例化一个NSDateFormatter对象
    [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];//设定时间格式,这里可以设置成自己需要的格式
    NSDate *date =[dateFormat dateFromString:@"1980-01-01 00:00:01"];
     
    日期转换为字符串
    NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];//实例化一个NSDateFormatter对象
    [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];//设定时间格式,这里可以设置成自己需要的格式
    NSString *currentDateStr = [dateFormat stringFromDate:[NSDate date]];
    使用NSNumberFormatter将数值转换成字符串
    Simplifying NSNumberFormatter Use on the iPhone With Objective-C Categories
    Here are the different formatter styles, and the result when converting [NSNumber numberWithDouble:123.4] into an NSString.
    NSNumberFormatterNoStyle (123)
    NSNumberFormatterDecimalStyle (123.4)
    NSNumberFormatterCurrencyStyle ($123.40)
    NSNumberFormatterPercentStyle (12,340%)
    NSNumberFormatterScientificStyle (1.234E2)
    NSNumberFormatterSpellOutStyle (one hundred and twenty-three point four)
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    formatter.numberStyle = NSNumberFormatterCurrencyStyle;
    NSString *string = [formatter stringFromNumber:number];
    [formatter release];
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  • 原文地址:https://www.cnblogs.com/ios-wmm/p/10215180.html
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