Object-c 语言

字符串操作：

http://www.myexception.cn/mobile/455287.html

1,判断两字符串是否相同

NSString *str1 = @"hello pepe";   
 NSString *str2=[NSString stringWithFormat:@"hello %s","pepe"];   
if([str1 isEqualToString:str2]){     
   NSLog(@"相同");    
}    
else{      
  NSLog(@"不同");  
 }

2,浮点型运算

  CGRect screenRect=[UIScreenmainScreen].bounds;

CGFloat widthf= (screenRect.size.height-self.adView.frame.size.width)/2;

CGFloat heighf=screenRect.size.width-self.adView.frame.size.height-50.0f;