oc 字符串操作
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/--------操作字符串--NSString(静态字符串)---------------------
NSString *Beijing= @"北京欢迎您"; //字符串的声明
NSString *log=@"北京欢迎您a"; //[NSString stringWithFormat:@"I am '%@'",Beijing]; //字符串格式化
NSString *zhui = [Beijing stringByAppendingString:@"哈哈哈"]; //字符串追加
bool b=[Beijing isEqualToString:log]; //字符串比较
NSString *hh = @"http://www.sina.com.cn";
if([hh hasPrefix:@"http"]){ //查找以http开头的字符串
NSLog(@"含有http");
}else{
NSLog(@"没有http");
}
NSString *ss = @"123";
int a = [ss intValue]+13; //字符串转int型
double dd = [ss doubleValue]+33.3; //字符串转double型
NSLog(@"%g",dd);
//字符串转数组
NSString *zifuchuan =@"one,two,three,four";
NSLog(@"string:%@",zifuchuan);
NSArray *array = [zifuchuan componentsSeparatedByString:@","];
// NSLog(@"array:%@",array); //输出整个数组中所有元素
NSString *value = [array objectAtIndex:0];