NSString转NSInteger，int，字符串
NSString *str1 = @"123";
NSString *str2 = @"456";
// 1，字符串拼接
NSString *newString = [NSString stringWithFormat:@"%@%@",str1,str2];
NSLog(@"newString =%@", newString);
//2，字符转NSInteger
NSInteger a = [newString integerValue];
NSLog(@"aaaaa =%ld", newString);
//2，NSInteger转字符
NSString *b = [NSString stringWithFormat:@"%ld",a];
NSLog(@"bbbbb=%@", b );
//2，字符转int
int intString = [newString intValue];
NSLog(@"intString =%d", intString);
//3，int转字符
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];
NSLog(@"stringInt =%@", stringInt);
//4，字符转float
float floatString = [newString floatValue];
NSLog(@"floatString =%f", floatString);
//5，float转字符
NSString *stringFloat = [NSString stringWithFormat:@"%f", floatString];
NSLog(@"stringFloat =%@", stringFloat);
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