IOS7开发～新UI学起（四）

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)));

}