iphone 开发笔记三

21、字符串截取
[starttime substringWithRange:<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">NSMakeRange(0,3)]<br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"> 从starttime的第0位开始，截取3个字符串长度</wbr>

22、字符串查找：
[allnum rangeOfString:@"ab"].location == NSNotFound
在allnum中查找ab，返回BOOL类型

23、UILabel显示换行的方法
label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;
比如NSString * xstring=@"lineone linetwo"

24、设置控件的位置：
failedview.frame = CGRectMake(0, 150, 480, 320);

25、动态生成按钮并绑定事件：

Objective-C代码

1. button=[UIButtonbuttonWithType:UIButtonTypeCustom];
2. [buttonaddTarget:selfaction:@selector(XXXXX:)
3. forControlEvents:UIControlEventTouchDown];
4. [buttonaddTarget:selfaction:@selector(YYYY:)
5. forControlEvents:UIControlEventTouchUpInside];
6. [buttonaddTarget:selfaction:@selector(ZZZZ:)
7. forControlEvents:UIControlEventTouchUpOutside];

26、动态设置按钮上的文字：
[btContinue setTitle:@"播放" forState:UIControlStateNormal]<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">; <p style="margin-top:0px; margin-bottom:10px; padding-top:0px; padding-bottom:0px; text-decoration:none"> </p> <p style="margin-top:0px; margin-bottom:10px; padding-top:0px; padding-bottom:0px; text-decoration:none"> <span style="color:#000080; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"><span style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">27、动态设置按钮的图片：</span></span><br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"> [btContinue setBackgroundImage:[UIImage imageNamed:@"animation_pause.<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">png"] forState:UIControlStateNormal]<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">;</wbr></wbr></p> <p style="margin-top:0px; margin-bottom:10px; padding-top:0px; padding-bottom:0px; text-decoration:none"> <span style="color:#000080; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"><span style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">28、<br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"></span></span>UITableView重新加载数据的方法：[<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">tableview reloadData];<br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"> UIPickerView重新加载数据的方法：[<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">pickerview reloadAllComponents];</wbr></wbr></p> <p style="margin-top:0px; margin-bottom:10px; padding-top:0px; padding-bottom:0px; text-decoration:none"> <span style="color:#000080; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"><span style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">29、中文乱码解决方法：</span></span><br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"> NSString *temp = [NSString stringWithCString:[thestring cString] encoding:NSUTF8StringEncoding]<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">;</wbr></p> <p style="margin-top:0px; margin-bottom:10px; padding-top:0px; padding-bottom:0px; text-decoration:none"> <span style="color:#000080; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"><span style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">30、设置控件的大小于坐标：</span></span><br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none"> thundertimelabel.frame = CGRectMake(61, 20, thundertimelabel.frame.size.<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">width, thundertimelabel.frame.size.<wbr style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; text-decoration:none">height);</wbr></wbr></p> </wbr>