// 使用实例方法创建NSString对象
NSString *string1 = [[NSStringalloc]initWithFormat:@"姓名流年"];
NSLog(@"%@", string1);
NSString *string2 = [[NSStringalloc]initWithFormat:@"Ming"];
NSLog(@"%@", string2);
NSString *string3 = [[NSStringalloc]initWithFormat:@"姓名：%@ 年龄：%d 爱好：%@", @"嘿嘿", 100, @"吃、喝、玩" ];
NSLog(@"%@",string3);
//把字符串转为数值类型
NSInteger intstr = [@"124" integerValue];
NSLog(@"%ld",intstr);
double m = [@"1000.00432" doubleValue];
NSLog(@"%lf", m);
//大小写转换
NSString *m1 = @"Have a good day";
NSString *m2 = [m1 uppercaseString];
NSString *m3 = [m1 lowercaseString];
NSString *m4 = [m1 capitalizedString];
NSLog(@"===%@ ++++%@ ****%@", m2, m3, m4);
//可变字符串
NSMutableString *string1 = [[NSMutableString alloc]initWithFormat:@"蓝欧科技有限公司"];
NSMutableString *string2 = [NSMutableString stringWithFormat:@"蓝欧科技有限公司"];
//拼接字符串
[string1 appendString:@".txt"];
NSLog(@"%@", string1);
//插入字符串
[string2 insertString:@"3G" atIndex:2];
NSLog(@"%@", string1);
//删除字符串
[string1 deleteCharactersInRange:NSMakeRange(2, 2)];
NSLog(@"%@", string1);
NSString *p0 = @"aBcD_EfGk";
if([p0 hasSuffix:@"EfGk"])
{NSString *p1 = [p0 stringByReplacingOccurrencesOfString:@"EfGk"withString:@"WXYZ"];
NSString *p2 = [p1 lowercaseString];
NSLog(@"%@",p2);
}
//使用类方法创建NSString对象
NSString *string2 = [NSStringstringWithFormat:@"蓝欧科技有限公司"];
NSLog(@"%@", string2);
//直接赋值
NSString *string3 = @"abc";
NSLog(@"%@", string3);
//获取字符串长度
NSInteger string1Length = [string1 length];
NSLog(@"%ld", string1Length);
NSInteger len2 = [string2 length];
NSLog(@"%ld", len2);
//判断字符串前缀
BOOL result1= [string1 hasPrefix:@"m"];
NSLog(@"------%d", result1);
BOOL result2 = [string1 hasSuffix:@"年"];
NSLog(@"%d",result2);
//查找字符串位置
NSRange range1 = [string2 rangeOfString:@"有"];
NSLog(@"位置：%ld 长度：%ld", range1.location, range1.length);
NSRange kk = [string2 rangeOfString:@"科技有"];
NSLog(@"weizhi:%ld lengt:%ld", kk.location, kk.length);
//截取字符串
NSString *p = [[string2 substringFromIndex:2]substringToIndex:4];
NSString *p1 = [string2 substringToIndex:4];
NSLog(@"~~~~~~~%@, %@", p, p1);
//NSArray数组类
//1.使用实例方法创建数组
NSArray *array1 = [[NSArrayalloc]initWithObjects:@"1",@"2",@"3", nil];
NSLog(@"%@", array1);
//2.使用类方法创建数组
NSArray *array2 = [NSArrayarrayWithObjects:@"4",@"5",@"6", nil];
NSLog(@"%@", array2);
//3.获取数组元素个数
NSUInteger count = [array1 count];
NSLog(@"%ld", count);
//4.根据索引值获取对象
NSString *p = [array1 objectAtIndex:1];
NSLog(@"%@", p);
//5.获取对象在数组中的索引值
NSUInteger index = [array1 indexOfObject:@"3"];
NSLog(@"%ld", index);
//NSMutableArray数组类
//1.使用实例方法创建
NSMutableArray *m1 = [[NSMutableArrayalloc]initWithObjects:@"a",@"b",@"c", nil];
//2。使用类方法创建
NSMutableArray *m2 = [NSMutableArrayarrayWithObjects:@"a",@"b",@"c", nil];
//3.添加元素
[m1 addObject:@"d"];
NSLog(@"%@",m1);
//4.插入元素
[m1 insertObject:@"ZZ"atIndex:1];
NSLog(@"%@",m1);
//5.删除元素
[m1 removeObject:@"ZZ"];
NSLog(@"%@",m1);
//6.替换元素
[m1 replaceObjectAtIndex:2withObject:@"Ming"];
NSLog(@"%@", m1);
//7.交换指定位置的2个元素
[m1 exchangeObjectAtIndex:1withObjectAtIndex:2];
NSLog(@"%@", m1);
//8.根据对象来交换两个元素的位置
[m1 exchangeObjectAtIndex:[m1 indexOfObject:@"a"] withObjectAtIndex:[m1 indexOfObject:@"Ming"]];
NSLog(@"%@",m1);
//9.遍历数组对象 （循环输出）
for (int i = 0; i < [m1 count]; i ++) {
NSString *m2 = [m1 objectAtIndex:i];
NSLog(@"普通遍历:%@",m2);
}
for (NSString *str in m1) {
NSLog(@"快速遍历:%@",str);
}
NSMutableArray *book = [NSMutableArrayarrayWithObjects:@"AAA",@"BBB",@"CCC",@"DDD", nil];
[book addObject:@"MMM"];
[book removeObject:@"CCC"];
[book replaceObjectAtIndex:0withObject:@"WWW"];
NSUInteger i = [book indexOfObject:@"BBB"];
NSString *p1 = [book objectAtIndex:i];
NSLog(@"%@", p1);
for (NSString *list in book) {
NSLog(@"%@",list);
}
NSLog(@"%@", book);
NSMutableArray *n = [NSMutableArrayarrayWithObjects:@"1",@"2",@"3", nil];
NSNumber *num = [NSNumbernumberWithFloat:4.4];
NSLog(@"%@",num);
[n addObject:num];
NSLog(@"%@",n);
NSNumber *n1 = [n objectAtIndex:3];
NSLog(@"%@",n1);
CGFloat n2 = [n1 intValue];
NSLog(@"%.2lf",n2);
NSRange p2 = NSMakeRange(4, 4);
NSString *p3 = [string2 substringWithRange:NSMakeRange(2,4)];
NSLog(@"%@", p3);
//拼接
NSString *p4 = [string2 stringByAppendingString:@"123"];
NSLog(@"%@",p4);
//替换
NSString *p5 = [string2 stringByReplacingOccurrencesOfString:@"蓝欧"withString:@"abcdef"];
NSLog(@"%@", p5);
//比较
NSString *p6 = @"a";
NSString *p7 = @"B";
NSComparisonResult result3 = [p6 compare:p7];
NSLog(@"%ld",result3);
NSString NSArray和可变字符串、数组的用法,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/mingtiannihao/p/3721026.html
