Category Archives: 项目实战(iOS)

自定义UISearchBar 适配IOS6和IOS7

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考虑到统一ios6与ios7的界面风格，UISearchBar通过重自定义来实现，重写一个类继承自UISearchBar

1、效果图：

QQ20140819-1@2x

2、部分代码：
附注释说明

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SASearchBar.h
#import <UIKit/UIKit.h>
 
@interface SASearchBar : UISearchBar
 
@property (nonatomic, strong)   UITextField     *textField;
 
@property (nonatomic, strong)   UIButton        *searchBtn;
 
@end

SASearchBar.m[……]

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UIAttributedString自动换行问题

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网上搜了大半天，如出一辙的结果如下：

设置行间距和换行模式都是设置一个属性：kCTParagraphStyleAttributeName，这个属性里面又分为很多子

属性，其中就包括

kCTLineBreakByCharWrapping
kCTParagraphStyleSpecifierLineSpacingAdjustment

设置如下：

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//段落
    //line break
CTParagraphStyleSetting lineBreakMode;
CTLineBreakMode lineBreak = kCTLineBreakByCharWrapping; //换行模式
lineBreakMode.spec = kCTParagraphStyleSpecifierLineBreakMode;
lineBreakMode.value = &lineBreak;
lineBreakMode.valueSize = sizeof(CTLineBreakMode);
 
    //行间距
CTParagraphStyleSetting LineSpacing;
CGFloat spacing = 4.0;  //指定间距
LineSpacing.spec = kCTParagraphStyleSpecifierLineSpacingAdjustment;
LineSpacing.value = &spacing;
LineSpacing.valueSize = sizeof(CGFloat);
 
CTParagraphStyleSetting settings[] = {lineBreakMode,LineSpacing};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, 2);   //第二个参数为settings的长度
[attributedString addAttribute:(NSString *)kCTParagraphStyleAttributeName
                         value:(id)paragraphStyle
                         range:NSMakeRange(0, attributedString.length)];

[……]

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iOS6创建iOS7风格导航导，导航条自动添加返回按钮

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- (void)viewDidLoad
{
    [super viewDidLoad];
 
    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7.0) {
 
        // 1、修改导航条样式
        UINavigationBar *bar = [UINavigationBar appearance];
        // 修改导航条背景
        [bar setBackgroundImage:[UIImage imageNamed:@"navigationbar_background.png"] forBarMetrics:UIBarMetricsDefault];
        // 修改导航条文字样式
        [bar setTitleTextAttributes:@{
                                      UITextAttributeTextColor : [UIColor blackColor],
                                      UITextAttributeTextShadowOffset : [NSValue valueWithUIOffset:UIOffsetZero]
                                      }];
 
 
        // 2、修改导航条按钮样式
        UIBarButtonItem *item = [UIBarButtonItem appearance];
 
        UIImage *normal = [UIImage imageNamed:@"navigationbar_button_background.png"];
        UIImage *highlight = [UIImage imageNamed:@"navigationbar_button_background_pushed.png"];
 
        // 修改导航条按钮背景
        [item setBackgroundImage:normal forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
        [item setBackgroundImage:highlight forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];
 
        // 修改导航条按钮文字样式
        [item setTitleTextAttributes:@{
                                       UITextAttributeTextColor : kBlueColor,
                                       UITextAttributeTextShadowOffset : [NSValue valueWithUIOffset:UIOffsetZero],
                                       } forState:UIControlStateNormal];
        [item setTitleTextAttributes:@{
                                       UITextAttributeTextColor : kBlueColor,
                                       UITextAttributeTextShadowOffset : [NSValue valueWithUIOffset:UIOffsetZero]
                                       } forState:UIControlStateHighlighted];
 
        [item setBackButtonBackgroundImage:normal forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
        [item setBackButtonBackgroundImage:highlight forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];
 
        // 3、修改状态栏样式
        [UIApplication sharedApplication].statusBarHidden = NO;
        [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
 
    }
}
 
#pragma mark - 2、代理方法
#pragma mark 2.1、控制器将要视图显示
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    // 在未自定义导航条返回键的情况下，iOS6及以下版本设备导航条自动添加仿iOS7返回按钮（根控制器例外）
    if (!(viewController == navigationController.viewControllers.firstObject || [(RMBaseVCtrl *)viewController isCustomNBI]) && [viewController isKindOfClass:[RMBaseVCtrl class]]){
 
        // 栈控制器数组
        NSArray *vcs = navigationController.viewControllers;
 
        // 前一个控制器序号
        int penultimate = (int)vcs.count - 2;
 
        if (penultimate >= 0) {
 
            // 前一个控制器标题[......]<p class="read-more"><a href="https://www.yusian.com/blog/project/2014/08/09/232925559.html">继续阅读</a></p>