IOS7开发~新UI学起(四)

1、UITableView:

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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)];

    //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:

IOS7开发~新UI学起(四)_第2张图片

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)));

}


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其他:

IOS7开发~UI学起(一)

IOS7开发~UI学起(二)

IOS7开发~UI学起(三)

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