1、UITableView：
UITableViewDelegate 新增内容：
// Use the estimatedHeigh(估算高度)t methods to quickly calcuate guessed values which will allow for fast load times of the table.
// If these methods are implemented, the above -tableView:heightForXXX calls will be deferred until views are ready to be displayed, so more expensive logic can be placed there.
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return50;
} // 这个方法先返回一个估算的cell高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{ kPrintInfo
return 40;
} 然后这个方法才返回真正的cell高度
这两个方法同理
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForHeaderInSection:(NSInteger)section；
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForFooterInSection:(NSInteger)section；
新增属性：
@property(nonatomic) CGFloat estimatedRowHeight ;// default is 0, which means there is no estimate
@property(nonatomic) CGFloat estimatedSectionHeaderHeight ;// default is 0, which means there is no estimate
@property(nonatomic) CGFloat estimatedSectionFooterHeight ;// default is 0,
通过新增代理放大不难知道，上述三个新增属性不难理解了。
// the background color of the section index while not being touched（当section不被触摸时候的背景颜色）
@property(nonatomic,retain)UIColor *sectionIndexBackgroundColor;
2、UIButton：
UIButton的这个属性是 IOS6引入的，以前没注意到：
- (void)setAttributedTitle:(NSAttributedString *)title forState:(UIControlState)stateNS_AVAILABLE_IOS(6_0);// default is nil. title is assumed to be single line
用法如下：
- (NSMutableAttributedString *) getString
{
NSMutableAttributedString *attriString = [[NSMutableAttributedStringalloc]initWithString:@"this is test!"];
//改变this的字体，value必须是一个CTFontRef
[attriString addAttribute:(NSString *)kCTFontAttributeName
value:CFBridgingRelease(CTFontCreateWithName((CFStringRef)[UIFontboldSystemFontOfSize:14].fontName,14,NULL))
range:NSMakeRange(0,4)];
//给this加上下划线，value可以在指定的枚举中选择
[attriString addAttribute:(NSString *)kCTUnderlineStyleAttributeName
value:(id)[NSNumbernumberWithInt:kCTUnderlineStyleDouble]
range:NSMakeRange(0,4)];
return attriString;
}
- (void)viewDidLoad
{
[superviewDidLoad];
[btsetAttributedTitle:[selfgetString]forState:UIControlStateNormal];
}
3、UIDatePicker：
不想说什么了～
4、UISteper：
- (void)viewDidLoad
{
[super viewDidLoad];
UIStepper *myStepper = [[UIStepper alloc] initWithFrame:CGRectMake(0, 10, 320, 50)];
myStepper.backgroundColor = [UIColor redColor];
[myStepper addTarget:self
action:@selector(myAction:)
forControlEvents:UIControlEventValueChanged];
[self.view addSubview:myStepper];
}
- (void) myAction:(UIStepper *) sender
{
CFShow((__bridge CFTypeRef)(@(sender.value)));
}
