xcode 常用 累積

//屏幕上顯示東西
NSLog(@"%d",myint);


// NSstring 轉 NSdata
NSString *aString = @"1234abcd";


NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding];


// NSMutableData  NSData 轉換
NSData *data=[[NSData alloc]init];
NSMutableData *mdata=[[NSMutableData alloc]init];
mdata=[NSData dataWithData:data];


//NSString轉換 NSMutableData 
NSMutableData *data;
NSString *myString = @"Some text";
data = [NSMutableData dataWithBytes:[myString cString] length:[myString length]];




 //解決中文亂碼,用GBK
 NSStringEncoding enc =                       
 CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);  
 NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];
 
 aString=[NSString stringWithFormat:@"┃發站┃%-12s┃到站┃%-14s┃\n" "杭州" "寶應"]; 


//NSMutableData 清空
[data resetBytesInRange:NSMakeRange(0, [data length])];

[data setLength:0];

延時
[NSThread sleepForTimeInterval:3]