1、打印view所有子视图
1、打开终端输入一下三条命令:
touch ~/.lldbinit
echo display @import UIKit >> ~/.lldbinit
echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
输入完没有任何显示就表示成功了,可以打上断点并在控制台输入相关命令查看层级关系,如:
po self.view.frame(打印当前视图的frame)
po [[self view]recursiveDescription](打印所有视图的层级关系)
2、layoutSubviews调用时机
当视图第一次显示的时候会被调用
当这个视图显示在屏幕上了,点击按钮
添加子视图也会调用这个方法
当本视图的大小发生改变时,也会调用这个方法
当子视图的frame发生改变时,也会调用这个方法
当删除子视图时会调用方法
3、NSString过滤特殊字符
//定义一个特殊字符的集合
NSCharaterSet *set = [NSCharaterSet charaterSetWithCharaterInString:
@"@/:;(}{}][//\\@#$%$#%$%@#!@#"];
//过滤字符串的特殊字符
NSString *newString = [trimString stringByTrimmingCharacterInSet:set];
4、TranForm属性
//平移按钮
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformRotate(transForm, 10, 0 );
//旋转按钮
self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4 );
//缩放按钮
self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2);
//初始化复位
self.buttonView.transform = CGAffineTransformIdentity;
5、去掉分割线多余15像素
//首先在viewDidLoad方法加入以下代码
if ([self.tableView respondsToSelector:@selector(setSparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetZero];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgesetsZero];
}
然后在重写willDisplaycell方法
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cellforRowAtIndexPath:(NSIndexPath *)indexPath {
if ([cell reaspondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToselector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargrgins:UIEdgeInsetsZero];
}
}
6、计算方法耗时时间间隔
//获取时间间隔
#define TICK CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
#define TOCK NSLog(@“Time: %f , CFAbsoluteTimeGetCurrent()-start”)
7、Color颜色宏定义
//随机颜色
#define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1]
//颜色(RGB)
#define RGBCOLOR(r , g , b) [UIColor colorWithRed:(r) / 255.0f green:(g) / 255.0f blue:(b) / 255.0f alpha:1]
//利用这种方法设置颜色和透明度,可不影响子视图背景色
#define RGBACOLOR(r , g , b , a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)];
8、Alert提示宏定义
#define Alert(_S_, ...) [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil] show]
9、让ios应用直接退出
- (void)exitApplication {
AppDelegate *app = [UIApplication sharedApplication].delegate;
UIWindow *window = app.window;
[UIView animateWithDuration:1.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished) {
exit:(0);
}];
}
10、NSArray快速求总和 最大值 最小值和平均值
NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);
11、修改Label中不同文字颜色
- (void)touchesEnded:(NSSet<UITouch>*)touches withEvent:(UIEvent*)event{
[self edotStringColor:Self.label.text editStr:@"好" color:[UIColor blueColor]];
}
- (void) edotStringColor:(NSString *)string editStr:(NSString*)edotStr color:(UIColor*)color{
//string为整体字符串,editStr为需要修改的字符串
NSRange rande = [string rangeOfString:editStr];
NSMutableAttributedString*attribute = [[NSMutableAttributedString alloc] initWithString:striking];
[attribute addAttributes:@{NSForegroundColorAttributeName:color} rande:range];
self.label.attributedText = attribute;
}
12、播放声音
#import<AVFoundation>
//1.获取音效资源的路径
NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"];
//2.将路径转化为url
NSURL *tempUrl = [NSURL fileURLWithPath:path];
//3.用转化为的url创建一个播放器
NSError *error = nil;
AVAudioPlayer *play = [[AVAudioPlayer alloc] initWithContentsOfURL:tempUrl error:&error];
self.player = play;
//4.播放
[play play];
13、检测是否IPad Pro
- (BOOL)ispadPro {
UIScreen *Screen = [UIScreen mainScreen];
CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;
CGFloat height = Screen.nativeBouns.size.height/Screen.nativeScale;
BOOL islpad = [[UIDevice currentDevice] userlnterfaceldiom] == UIUserInterfaceIdiomPad;
BOOL hasIPadProWidth = fabs(width - 1024.f) < DBL xss = removed xss=removed xss = removeed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed>> ~/.lldbinit
echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
}
14、Label行间距
- (void) test {
NSMutableAttributedString *attributedString = [[NSMutableAttributtedString alloc] initWithString:self.contentLabel.text];
NSMutableParagraghStyle*paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[garagraphStyle setLineSpacing:3];
//调整行间距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0,[self.contentLabel.text length])];
self.contentLabel.attributedText = attributedString;
}
15、UIIMageView填充模式
@"UIViewContentModeScaleTofill", // 拉伸自适应填满整个视图
@"UIViewContentModeScaleAspetFit" // 自适应比例大小显示
@"UIViewContentModeScaleAspectFill" // 原始大小显示
@"UIViewContentModeRedraw", // 尺寸改变时重绘
@"UIViewContentModeCenter",// 中间
@"UIViewContentModeTop",//顶部
@"UIViewContentModeBottom",//底部
@"UIViewContentModeLeft",//中间贴左
@"UIViewContentModeRight",//中间贴右
@"UIViewContentModeTopLeft", // 贴左上
@"UIViewContentModeTopRight", // 贴右上
@"UIViewContentModeBottomLeft", // 贴左下
@"UIViewContentModeBottomRight", // 贴右下
16、Debug栏自动把Unicode编码转化为汉字
DXXcodeConsoleUnicodePlugin 插件
17、设置状态栏文字样式颜色
[UIAppliction sharedApplication] setStatusBarHidden :NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
18、字符串的相关操作
//去除所有的空格
[str stringByReplacingOccurrencesOfString:@" " withString:@""];
//去掉首尾的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
- (NSString *)uppercaseString;//全部字符转化为大写字母
- (NSString *)lowercaseString;//全部字符转化为小写字母
19、解决tableview的分割线短一截
-(void)viewDidLayoutSubviews{
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)])
{
{[self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)])
{
[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)];
}
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)])
{
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)])
{
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
20、动态隐藏NavigationBar
//当我们的手离开屏幕时候隐藏
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
if(velocity.y > 0)
}
[self.navigationController setNavigationBarHidden:YES animated:YES];
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
velocity.y这个量,在上滑和下滑时,变化极小(小数),但是因为方向不同,有正负之分,这就很好处理了。
//在滑动过程中隐藏
self.navigationController.hidesBarsOnSwipe = YES;
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat offsetY = scrollView.contentOffset.y + __tableView.contentInset.top;
CGFloat panTranslationY = [scrollView.panGestureRecognizer translationInView:self.tableView].y;
if (offsetY > 64) {
if (panTranslationY > 0)
{
//下滑趋势,显示
[self.navigationController setNavigationBarHidden:NO animated:YES];
} else {
//上滑趋势,隐藏
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
这里的offsetY > 64只是为了在视图滑过navigationBar的高度之后才开始处理,防止影响展示效果。panTranslationY是scrollView的pan手势的手指位置的y值,可能不是太好,因为panTranslationY这个值在较小幅度上下滑动时,可能都为正或都为负,这就使得这一方式不太灵敏.
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