不变字符串NSSting

//使用实例方法创建NSSting的对象

NSString *string1 =
[[NSString alloc] initWithFormat:@"姓名：%@", @"hfjs"];

NSString *string2 =
[[NSString alloc]
initWithFormat:@"姓名"];

NSLog(@"%@ %@",
string1, string2);

int a
= 10;

NSString *string3 =
[[NSString alloc] initWithFormat:@"%d",
a];

NSLog(@"%@",
string3);

//使用类方法创建NSString对象

NSString *string4 =
[NSString stringWithFormat:@"蓝鸥"];

NSLog(@"%@",
string4);

//直接赋值

NSString *string5
= @"safsdafsafas";

NSLog(@"%@", string5);

//获取字符串长度

NSUInteger string2Length =
[string2 length];

NSLog(@"%ld",
string2Length);

//判断字符串前缀

BOOL result1 =
[string1 hasPrefix:@"姓"];

NSLog(@"%d",
result1);

//判断字符串后缀

BOOL result2 =
[string5 hasSuffix:@"s"];

NSLog(@"%d",
result2);

//查找字符串所在位置

NSRange range1 =
[string5 rangeOfString:@"dafs"];

NSLog(@"location:%ld
length:%ld”, range1.location,
range1.length);

//要查找的字符串的首字符位置，和查找的长度

//字符串截取

NSString *string6 =
[string5 substringFromIndex:2];

NSLog(@"%@", string6);

//从指定第几个字符开始截取，到最后结束

NSString *string7 =
[string5 substringToIndex:6];

//从第一位字符开始，截取到指定位置结束

NSLog(@"%@",
string7);

// NSMakeRange(<#NSUInteger loc#>, <#NSUInteger
len#>)  传位置 和 长度

NSString *string8 =
[string5 substringWithRange:NSMakeRange(2, 5)];

//区间查找

NSLog(@"%@",
string8);

//拼接字符串：append

NSString *string9 =
[string1stringByAppendingString:@".sdf"];

NSLog(@"%@",
string9);

//替换字符串：replacing

NSString *tihuan =
[string1stringByReplacingOccurrencesOfString:@“姓名” withString:@"蓝鸥3g"];

NSLog(@"%@",
tihuan);

//字符串比较：compare

NSString *b
= @"abc";

NSString *c
= @"Abc";

NSComparisonResult result
= [b compare:c];

switch (result) {

case NSOrderedAscending:

NSLog(@"b < c");

break;

case NSOrderedDescending:

NSLog(@"b > c");

break;

case NSOrderedSame:

NSLog(@"b = c");

break;

default:

break;

}

//字符串和数值类型转换：int/double/float

NSString *d
= @"6431";

NSInteger intStr =
[d integerValue];

NSLog(@"%ld",
intStr);

double douleStr =
[@"524.5265" doubleValue];

NSLog(@"%lf",
douleStr);

//大小写转换：low/up

NSString *a1 = @"mY NamE
iS ZhanG QianG";

NSString *uppercaseStr =
[a1 uppercaseString];

NSString *lowercaseStr =
[a1 lowercaseString];

NSString *capitalizedStr =
[a1 capitalizedString];

NSLog(@"%@",
uppercaseStr);

NSLog(@"%@",
lowercaseStr);

NSLog(@"%@",
capitalizedStr);

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