NSString *tempA = @"123";
NSString *tempB = @"456";
1,字符串拼接
2,字符转int
int intString = [newString intValue];
3,int转字符
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];
4,字符转float
5,float转字符
NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];
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