Demo地址先上

 NSString *msg = @"1.如果你有女朋友\n2.請(qǐng)她吃東西?--你拉倒吧,吃胖了怎么辦.\n3.恩.我想跟你談戀愛?恩,你喜歡我,不關(guān)我事.\n4.追啊追...我的驕傲放縱";

系統(tǒng)的

Snip20170720_1.png

然而,我想要居左訂格的,比如用到版本更新提示的時(shí)候

UIAlertView

遍歷subviews 即可獲取msg對(duì)應(yīng)的label,設(shè)置msglabel 居左屬性即可
省事啊,可是沒(méi)有margin ,效果貼邊怎么辦

NSInteger count = 0;
        for( UIView * view in alert.subviews )
        {
            if( [view isKindOfClass:[UILabel class]] )
            {
                count ++;
                if ( count == 2 ) { //僅對(duì)message左對(duì)齊
                    UILabel* label = (UILabel*) view;
                    //                    label.frame = CGRectMake(20, -20,200, size.height- 10);
                    label.textAlignment =NSTextAlignmentLeft;
                }
            }
        }

UIAlertController

UIAlertController獲取msg所屬的label,有一點(diǎn)點(diǎn)麻煩...不過(guò)總有父視圖,sub...sub...sub 總會(huì)找到的

UIView *subView1 = alertController.view.subviews[0];
    UIView *subView2 = subView1.subviews[0];
    UIView *subView3 = subView2.subviews[0];
    UIView *subView4 = subView3.subviews[0];
    NSLog(@"subvie4 - %@",subView4.subviews);

    UIView *subView5 = subView4.subviews[0];
    NSLog(@"subvie5 - %@",subView5.subviews);

來(lái),看下控制臺(tái)輸出的

subvie4 - (
    "<UIView: 0x7ff520f09e60; frame = (0 0; 0 0); layer = <CALayer: 0x608000230a80>>"
)
subvie5 - (
    "<UILabel: 0x7ff520f0a390; frame = (0 0; 0 0); text = '\U4e0d\U4f1a\U8ffd,\U6211\U6559\U4f60\U554a'; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x608000284ba0>>",
    "<UILabel: 0x7ff520f0aaa0; frame = (0 0; 0 0); text = '1.\U5982\U679c\U4f60\U6709\U5973\U670b\U53cb\n2.\U8bf7\U5979\U5403\U4e1c\U897f?--\U4f60\U62c9\U5012\U5427,...'; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x608000284ce0>>",
    "<UIView: 0x7ff520f0af40; frame = (0 0; 0 0); clipsToBounds = YES; layer = <CALayer: 0x6080002309c0>>",
    "<UIView: 0x7ff520f0b0e0; frame = (0 0; 0 0); clipsToBounds = YES; layer = <CALayer: 0x60800022d7e0>>"
)

沒(méi)錯(cuò),多了兩個(gè)label,找到這倆坑貨了,別問(wèn)我怎么區(qū)分誰(shuí)是title ,誰(shuí)是message的,沒(méi)錯(cuò)---我試出來(lái)的.后面就可以隨意居左,居中,居右了

UILabel *lab_title = subView5.subviews[0];
UILabel *lab_message = subView5.subviews[1];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];
 [alertController addAction:cancelAction];
lab_message.textAlignment = NSTextAlignmentLeft;
lab_title.textAlignment = NSTextAlignmentCenter;
[vc presentViewController:alertController animated:YES completion:nil];

Snip20170720_2.png

這樣是不是好一些啦?不好?哦~
什么?你想要彩色的標(biāo)題?什么?你想要大號(hào)的message?可以啊,后面隨意啦~

//可富文本展示 -
     NSMutableAttributedString *alertControllerStr = [[NSMutableAttributedString alloc] initWithString:title];
     [alertControllerStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 2)];
     [alertControllerStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(3, 2)];
     [alertController setValue:alertControllerStr forKey:@"attributedTitle"];
     
//     修改message
     NSMutableAttributedString *alertControllerMessageStr = [[NSMutableAttributedString alloc] initWithString:message];
     [alertControllerMessageStr addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0, 2)];
     [alertControllerMessageStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(3, 4)];
     [alertControllerMessageStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(5, 3)];
     [alertController setValue:alertControllerMessageStr forKey:@"attributedMessage"];
//     修改按鈕的顏色
     [cancelAction setValue:[UIColor cyanColor] forKey:@"titleTextColor"];

Snip20170720_3.png

不過(guò)這個(gè)樣式有些固定,需要自己做range ,設(shè)置屬性,煩的死!那就自定義吧,加載html富文本樣式,后臺(tái)返回,移動(dòng)端直接加載,那就來(lái)吧.
搜了些自定義的alert ,發(fā)現(xiàn)挺喜歡customiOSAlert這個(gè)的,高度自定義很方便(html 富文本,計(jì)算高度先,想要滾動(dòng)的就加scrollow,想跟系統(tǒng)更接近,就把動(dòng)畫去掉,按鈕弄弄,多個(gè)按鈕分割線,稍微改一下).下面是我項(xiàng)目中一些場(chǎng)景

NSString *htmlSr = @"<p>你好</p><p>        這是一個(gè)例子，請(qǐng)顯示</p><p>外加一個(gè)table</p><table><tbody><tr class=\"firstRow\"><td valign=\"top\" width=\"261\">aaaa</td><td valign=\"top\" width=\"261\">bbbb</td><td valign=\"top\" width=\"261\">cccc</td></tr></tbody></table><p></p>";
    
CustomIOSAlertView *alertView = [[CustomIOSAlertView alloc] init]; 
[alertView setContainerView:[self createView:htmlSr title:@"來(lái)"]];
[alertView setButtonTitles:@[@"確定",@"取消"]];
//    [alertView setDelegate:self];
[alertView setOnButtonTouchUpInside:^(CustomIOSAlertView *alertView, int buttonIndex) {
        NSLog(@"sett -ldd- %d",buttonIndex);
        [alertView close];
}];
[alertView setUseMotionEffects:true];
[alertView show];

Snip20170720_4.png

猿友們,拿去擼~