IOS开发基础知识--碎片12_移动开发_编程开发_程序员俱乐部

1:Delegate运用

.h
#import <UIKit/UIKit.h>
@protocol FilterHeaderViewDelegate <NSObject>
@required
-(void)filterHeaderViewMoreBtnClicked:(id)sender;
@end

extern float CYLFilterHeaderViewHeigt;
@interface FilterHeaderView : UICollectionReusableView
@property (nonatomic, weak  ) id<FilterHeaderViewDelegate> delegate;
@end

.m
- (void)moreBtnClicked:(id)sender {
    if ([self.delegate respondsToSelector:@selector(filterHeaderViewMoreBtnClicked:)]) {
        [self.delegate filterHeaderViewMoreBtnClicked:self.moreButton];
    }
}
注意在.m中会有要调用上面这个方法：
[self.moreButton addTarget:self action:@selector(moreBtnClicked:) forControlEvents:UIControlEventTouchUpInside];

而在调用这个插件的时候记得把delegate赋于self,并要把FilterHeaderViewDelegate引入到<>里；然后就可以实现这个deletage的方法；

2：实现UIButton不同状态下的显示

[btn setTitle:@"更多" forState:UIControlStateNormal];
    [btn setTitle:@"收起" forState:UIControlStateSelected];
    btn.titleLabel.font = [UIFont systemFontOfSize:12];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateSelected];
    btn.adjustsImageWhenHighlighted = NO;
    [btn setImage:[UIImage imageNamed:@"home_btn_more_normal"] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"home_btn_more_selected"] forState:UIControlStateSelected];
    btn.titleEdgeInsets = UIEdgeInsetsMake(0, -btn.imageView.frame.size.width-kImageToTextMargin, 0, btn.imageView.frame.size.width);
    btn.imageEdgeInsets = UIEdgeInsetsMake(0, btn.titleLabel.frame.size.width, 0, -btn.titleLabel.frame.size.width);

3：视图uiview增加点击事件

    if (!_TicketView) {
        _TicketView=[UIView new];
        _TicketView.backgroundColor=[UIColor whiteColor];
        //增加点击事件
        UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(TickAction:)];
        [_TicketView addGestureRecognizer:tapGesture];
        [_BelowView addSubview:_TicketView];
    }

调用：

-(void)TickAction:(id)sender
{
    NSLog(@"sdfsdfsdf");
}

4：在ios7中出现滚动视图UIScrollView不兼容问题，无法滚动

把contentSize定义放在viewDidLayoutSubviews中；
-(void)viewDidLayoutSubviews
{
    _myScrollView.contentSize=CGSizeMake(SCREEN_WIDTH,600);
}

5：对UIButton上的图标进行翻转

#define DEGREES_TO_RADIANS(angle) ((angle)/180.0 *M_PI)

调用：
_BtnMoreContent.imageView.transform = CGAffineTransformRotate(_BtnMoreContent.imageView.transform, DEGREES_TO_RADIANS(180));

6：创建一个背景图片，并从网络动态加载

在viewDidLoad调用：

-(void)LoadBackViewImage
{
    UIImageView *bgView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
    
    bgView.image=[UIImage imageNamed:@"bgWeatherEmpty"];
    
    [bgView sd_setImageWithURL:[NSURL URLWithString:self.backImageUrl] placeholderImage:[UIImage imageNamed:@"bgWeatherEmpty"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        dispatch_async(dispatch_get_main_queue(), ^{
            bgView.image=image;
            [self.view addSubview:bgView];
            [self.view sendSubviewToBack:bgView];
        });
    }];
}

注意：

UIView层次管理（sendSubviewToBack，bringSubviewToFront）
 将一个UIView显示在最前面只需要调用其父视图的 bringSubviewToFront（）方法。
将一个UIView层推送到背后只需要调用其父视图的 sendSubviewToBack（）方法。

7：加载xib到其它视图中

创建一个UIView的xib文件，这个方程可以看网上随便一个文章，主要是把属性中的custom Class指定给创建的那个 .h文件；

.h
#import <UIKit/UIKit.h>

@interface LKTextView : UIView
@property (strong, nonatomic) IBOutlet UILabel *lbText;
- (IBAction)bt_pressed:(id)sender;
@property (strong, nonatomic) IBOutlet UITextField *textView;
+(LKTextView*)instanceTextView;
@end

.m
#import "LKTextView.h"
#import "RKTabView.h"
#import "RKTabItem.h"
@implementation LKTextView
@synthesize textView;
@synthesize lbText;

+(LKTextView *)instanceTextView
{
    NSArray* nibView =  [[NSBundle mainBundle] loadNibNamed:@"LKTextView" owner:nil options:nil];
    return [nibView objectAtIndex:0];
}
-(id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if(self)
    {
        //其它自个想增加到视图里的
        [self initViews];
        
    }
    return self;
}
/**
 *  @author wujunyang, 15-04-30 16:04:03
 *
 *  @brief  这边是运用RKTABVIEW创建一个标签的
 */
-(void)initViews
{
    UIView *vi=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 20, 30)];
    vi.backgroundColor=[UIColor redColor];
    [self addSubview:vi];
    
    RKTabView *titledTabsView=[[RKTabView alloc] initWithFrame:CGRectMake(0, 0, 200, 50)];
    [self addSubview:titledTabsView];
    
    RKTabItem *mastercardTabItem = [RKTabItem createUsualItemWithImageEnabled:nil imageDisabled:[UIImage imageNamed:@"mastercard"]];
    mastercardTabItem.titleString = @"MasterCard";
    RKTabItem *paypalTabItem = [RKTabItem createUsualItemWithImageEnabled:nil imageDisabled:[UIImage imageNamed:@"paypal"]];
    paypalTabItem.titleString = @"PayPal";
    RKTabItem *visaTabItem = [RKTabItem createUsualItemWithImageEnabled:nil imageDisabled:[UIImage imageNamed:@"visa"]];
    visaTabItem.titleString = @"Visa";
    RKTabItem *wuTabItem = [RKTabItem createUsualItemWithImageEnabled:nil imageDisabled:[UIImage imageNamed:@"wu"]];
    wuTabItem.titleString = @"Western Union";
    RKTabItem *wireTabItem = [RKTabItem createUsualItemWithImageEnabled:nil imageDisabled:[UIImage imageNamed:@"wire-transfer"]];
    wireTabItem.titleString = @"Wire Transfer";
    
    //mastercardTabItem.tabState = TabStateEnabled;
    
    titledTabsView.darkensBackgroundForEnabledTabs = YES;
    titledTabsView.horizontalInsets = HorizontalEdgeInsetsMake(25, 25);
    titledTabsView.titlesFontColor = [UIColor colorWithWhite:0.9f alpha:0.8f];
    
    titledTabsView.tabItems = @[mastercardTabItem, paypalTabItem, visaTabItem, wuTabItem, wireTabItem];
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

- (IBAction)bt_pressed:(id)sender {
    lbText.text = textView.text;
}
@end

然后调用视图.m：

- (void)viewDidLoad
{
    
   LKTextView* text = [LKTextView instanceTextView];
    text.frame = CGRectMake(100, 100, text.frame.size.width, text.frame.size.height);
    text.textView.text = @"input ";
   [self.view addSubview:text];
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

 8：不错的插件

AutoLayout下自动计算UITableViewCell高度的扩展FDTemplateLayoutCell    https://github.com/forkingdog/UITableView-FDTemplateLayoutCell
多视图控制器间进行切换--XLPagerTabStrip                              https://github.com/xmartlabs/XLPagerTabStrip
不错的标签选项卡插件                                                 https://github.com/RafaelKayumov/RKTabView

9：ios7和ios8关于导航栏的那些事

ios7之前的版本中UIViewController中的view在显示后会自动调整为去掉导航栏的高度的，控件会自动在导航栏以下摆放。

在iOS7中UIViewController的wantsFullScreenLayout属性被舍弃了，所有的UIViewController创建后默认就是full Screen的，因此如果带导航栏的应用界面中的部分控件会被导航栏覆盖掉。

解决方案：可以使用ios7种UIViewController新增的属性extendLayoutIncludesOpaqueBars和edgesForExtendedLayout来解决。

其中这个属性指定了当bar使用不透明图片时，试图是否延伸至bar所在区域，默认值为NO。而edgesForExtendedLayout

其中这个属性指定了当Bar使用了不透明图片时，视图是否延伸至Bar所在区域，默认值时NO。而edgesForExtendedLayout则是表示视图是否覆盖到四周的区域，默认是UIRectEdgeAll，即上下左右四个方向都会覆盖，那么为让顶部不进行延伸到导航栏覆盖的区域，我们可以把顶部区域延伸去掉。实现代码如下：


self.extendedLayoutIncludesOpaqueBars = NO;

self.edgesForExtendedLayout = UIRectEdgeBottom | UIRectEdgeLeft | UIRectEdgeRight;