iOS-小总结

2017.11

1.父视图透明，子视图正常

blackView.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.6];

更多详细方式参考：iOS 设置视图半透明而子控件不透明

2.UITextField因过滤空格无法回退删除问题

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    
    NSString *textPsw = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    if (range.length == 1 && textPsw.length == 0) {
        return YES;
    }
    if ([textPsw length] == 0) {
        return NO;
    }
    return YES;
}

3.更改tabbar字体颜色

a.只能改变点击后的颜色

tabbar.tintColor = TABBAR_TITLE_SELECTED_COLOR;

b.能全局改变点击前、后的颜色

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [[UITabBarItem appearance] setTitleTextAttributes:@{ NSForegroundColorAttributeName:TABBAR_TITLE_DEFAULT_COLOR} forState:UIControlStateNormal];
    [[UITabBarItem appearance] setTitleTextAttributes:@{ NSForegroundColorAttributeName:TABBAR_TITLE_SELECTED_COLOR} forState:UIControlStateSelected];
}

c.改变某VC的tabBarItem点击前、后的颜色

    [vc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName:TABBAR_TITLE_DEFAULT_COLOR} forState:UIControlStateNormal];
    [vc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName:TABBAR_TITLE_SELECTED_COLOR} forState:UIControlStateSelected];

4.从导航栏下方开始布局

self.edgesForExtendedLayout = UIRectEdgeNone;

b.将导航栏设置不透明

self.navigationController.navigationBar.translucent = NO;

参考及详细介绍：iOS frame从导航栏下面开始 iOS edgesForExtendedLayout、extendedLayoutIncludesOpaqueBars、automaticallyAdjustsScrollViewInsets属性详解

2018.4.19

5.设置按钮点击前后的背景图片

[microphoneBtn setBackgroundImage:[UIImage imageNamed:@"mic_open"] forState:UIControlStateNormal];
[microphoneBtn setBackgroundImage:[UIImage imageNamed:@"mic_close"] forState:UIControlStateSelected];

先设置，点击前后的图片；然后实现点击方法，在其中加上：

sender.selected = !sender.selected;

即可。

6.设置按钮图片之后，点击左上角有蓝色块。

解决：将按钮UIButtonTypeSystem修改成UIButtonTypeCustom。

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