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  • IOS> NSString 常见数据类型转换:转NSInteger , NSDate(互转)

    1. NSString转NSInteger, 转int (float, double类似 )

    1.1正常情况 , NSString所包含内容确能转化为int的类型

    NSString *sNumber = @"123";
    NSInteger lNumber = [sNumber integerValue];
    int iNumber = [sNumber intValue];
    NSLog(@"字符串NSString: %@\n转换后-->\n长整型(64bit long): %ld\n整型(32bit int):%d", sNumber, (long)lNumber, (int)iNumber);

    执行结果

    字符串NSString: 123
    转换后-->
    长整型(64bit long): 123
    整型(32bit int):123
    

    1.2非正常情况 , NSString 包含不能转化为int的字符串

    NSString *sNumber = @"123abc";
    NSInteger lNumber = [sNumber integerValue];
    int iNumber = [sNumber intValue];
    NSLog(@"\n1. 字符串NSString: %@\n转换后-->\n长整型(64bit long): %ld\n整型(32bit int):%d", sNumber, (long)lNumber, (int)iNumber);
            
    NSString *sNumber2 = @"12a3bc";
    NSInteger lNumber2 = [sNumber2 integerValue];
    int iNumber2 = [sNumber2 intValue];
    NSLog(@"\n2. 字符串NSString: %@\n转换后-->\n长整型(64bit long): %ld\n整型(32bit int):%d", sNumber2, (long)lNumber2, (int)iNumber2);
            
    NSString *sNumber3 = @"1a23bc";
    NSInteger lNumber3 = [sNumber3 integerValue];
    int iNumber3 = [sNumber3 intValue];
    NSLog(@"\n3. 字符串NSString: %@\n转换后-->\n长整型(64bit long): %ld\n整型(32bit int):%d", sNumber3, (long)lNumber3, (int)iNumber3);
            
    NSString *sNumber4 = @"a123bc";
    NSInteger lNumber4 = [sNumber4 integerValue];
    int iNumber4 = [sNumber4 intValue];
    NSLog(@"\n4. 字符串NSString: %@\n转换后-->\n长整型(64bit long): %ld\n整型(32bit int):%d", sNumber4, (long)lNumber4, (int)iNumber4);

    执行结果

    1. 字符串NSString: 123abc
    转换后-->
    长整型(64bit long): 123
    整型(32bit int):123
    2015-07-20 22:18:24.1872. 字符串NSString: 12a3bc
    转换后-->
    长整型(64bit long): 12
    整型(32bit int):12
    2015-07-20 22:18:24.1873. 字符串NSString: 1a23bc
    转换后-->
    长整型(64bit long): 1
    整型(32bit int):1
    2015-07-20 22:18:24.1874. 字符串NSString: a123bc
    转换后-->
    长整型(64bit long): 0
    整型(32bit int):0

    可以看到,并没有报错,而且能转化的字符串能到第一个非数字字符为止。

    2. NSInteger转NSString: +stringWithFormat

    NSInteger lNumber = 1200l;
    NSString* sNumber = [NSString stringWithFormat:@"%ld", lNumber];
    NSLog(@"\n长整型(64bit long): %ld\n转换后-->\nNSString: %@", (long)lNumber, sNumber);

    执行结果

    长整型(64bit long): 1200
    转换后-->
    NSString: 1200

    3.NSString转NSDate

    (未完待续)...

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  • 原文地址:https://www.cnblogs.com/fortunely/p/4663133.html
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