iOS中字符串經常使用處理

NSString *tempA = @"123";

 NSString *tempB = @"456";

1，字符串拼接

 NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB];

2，字符轉int

int intString = [newString intValue];

3，int轉字符

NSString *stringInt = [NSString stringWithFormat:@"%d",intString];

4，字符轉float

 float floatString = [newString floatValue];

5，float轉字符

NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];

6.截取字符串
NSString*string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取下標7以後的字符串
NSLog(@"截取的值爲：%@",string);
[string substringFromIndex:2];//截取下標2以前的字符串
NSLog(@"截取的值爲：%@",string);


7.匹配字符串
NSString*string =@"sdfsfsfsAdfsdf";
NSRangerange = [stringrangeOfString:@"f"];//匹配獲得的下標
NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取範圍類的字符串
NSLog(@"截取的值爲：%@",string);


8.分隔字符串
NSString*string =@"sdfsfsfsAdfsdf";
NSArray *array = [string componentsSeparatedByString:@"A"]; //從字符A中分隔成2個元素的數組
NSLog(@"array:%@",array); //結果是adfsfsfs和dfsdf