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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