nsmutablearray

一、NSString 创建字符串。 NSString *astring = @ "This is a String!"; 创建空字符串，给予赋值。 NSString *astring = [[NSString alloc] init]; astring = @ "This is a String!"; NSLog(@ "astring:%@",astring); string release]; 使用变量初始化 NSString *name = @ "Ivan!"; NSString *astring = [[NSString stringWithFormat:@”My name is %@!”,name]]; NSLog(@ "astring:%@",astring); 判断是否包含某字符串 检查字符串是否以另一个字符串开头 - ( BOOL) hasPrefix: (NSString *) aString; NSString *String1 = @ "NSStringInformation.txt"; [String1 hasPrefix:@ "NSString"] == 1 ? NSLog(@ "YES") : NSLog(@ "NO"); [String1 hasSuffix:@ ".txt"] == 1 ? NSLog(@ "YES") : NSLog(@ "NO");

//一、NSString /*----------------创建字符串的方法----------------*/ //1、创建常量字符串。 NSString *astring = @"This is a String!"; //2、创建空字符串，给予赋值。 NSString *astring = [[NSString alloc] init]; astring = @"This is a String!"; [astring release]; NSLog(@"astring:%@",astring); //3、在以上方法中，提升速度:initWithString方法 NSString *astring = [[NSString alloc] initWithString:@"This is a String!"]; NSLog(@"astring:%@",astring); [astring release]; //4、用标准c创建字符串:initWithCString方法 char *Cstring = "This is a String!"; NSString *astring = [[NSString alloc] initWithCString:Cstring]; NSLog(@"astring:%@",astring); [astring release]; //5

一、NSString 创建字符串。 NSString *astring = @ "This is a String!" ; 创建空字符串，给予赋值。 NSString *astring = [[NSString alloc] init]; astring = @ "This is a String!" ; NSLog(@ "astring:%@" ,astring); string release]; 使用变量初始化 NSString *name = @ "Ivan!" ; NSString *astring = [[NSString stringWithFormat:@”My name is %@!”,name]]; NSLog(@ "astring:%@" ,astring); 判断是否包含某字符串 检查字符串是否以另一个字符串开头 - ( BOOL ) hasPrefix: (NSString *) aString; NSString *String1 = @ "NSStringInformation.txt" ; [String1 hasPrefix:@ "NSString" ] == 1 ? NSLog(@ "YES" ) : NSLog(@ "NO" ); [String1 hasSuffix:@ ".txt" ] == 1 ? NSLog(@ "YES" ) :

　　经常会遇到两个数组去对比然后进行去重的计算，看了网上很多文章，都是简单的两个数组的情况，很少有介绍两个模型数组的去重，于是自己写一点自己的经验吧。 　　首先准备一个模型对象，这里以Person为例，对象拥有name属性： @interface Person : NSObject /** 姓名 */ @property(nonatomic, copy) NSString *name; @end 　　然后分别准备两个模型数组，存放一些模型数据： NSMutableArray *arr_1 = [NSMutableArray array]; for (NSInteger i = 0; i < 1000; i++) { Person *p = [[Person alloc] init]; p.name = [NSString stringWithFormat:@"name_%zd", i]; [arr_1 addObject:p]; } NSMutableArray *arr_2 = [NSMutableArray array]; for (NSInteger i = 0; i < 1000; i++) { if (i % 2 == 0) { Person *p = [[Person alloc] init]; p.name = [NSString stringWithFormat:@