1. 设置导航栏返回按钮的文字

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];

2. 设置导航栏返回按钮的图片

self.navigationController.navigationBar.backIndicatorImage = [UIImage imageNamed:@"maskImage"];
self.navigationController.navigationBar.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"maskImage"];

3. 图片的拉伸

UIEdgeInsets inset = UIEdgeInsetsMake(19, 30, 19, 30);
UIImage *image = [[UIImage imageNamed:@"image"] resizableImageWithCapInsets:inset resizingMode:UIImageResizingModeStretch];

4. 计算文本frame

CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
CGFloat textMaxW = screenW - margin * 2;
CGSize textMaxSize = CGSizeMake(textMaxW, CGFLOAT_MAX);
NSDictionary *textAttr = @{NSFontAttributeName: textFont};
CGSize textSize = [content boundingRectWithSize:textMaxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:textAttr context:nil].size;

5. 增加label 行间距

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:content];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:4];
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [content length])];
self.EventResumeLabel.attributedText = attributedString;

6. storyBoard 增加控件圆角、边框颜色

layer.cornerRadius   Number   5
layer.borderUIColor  Color   
layer.borderWidth    Number   0.45

7. 阴影

self.backView.layer.shadowOpacity = 0.5;
self.backView.layer.shadowOffset = CGSizeMake(0, 2);
self.backView.layer.shadowColor = [UIColor redColor].CGColor;

8. 两个label 并排展示的空间问题

• 横排完成两个label的布局后，添加两个label 的
  • contentHugging 内容吸附
  • contentCompressionResistance - 内容压缩抵抗 属性

[self.nameLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

[self.timeLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

[self.nameLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];

[self.timeLabel setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

9. xcode8.0 取消控制台多余打印输出

edit scheme -> run -> Environment Variables -> OS_ACTIVITY_MODE  disable

10. application transport security

info.plist -> NSAppTransportSecurity -> NSAllowsArbitraryLoads - YES

11. 图片裁剪

CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContextWithOptions(size, YES, 0);
[backColor setFill];
UIRectFill(rect);
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

12. 画虚线

CGContextRef context = UIGraphicsGetCurrentContext();
UIBezierPath *path = [UIBezierPath bezierPathWithRect:rect];
[[UIColor redColor] setStroke];
path.lineWidth = 3;
CGFloat dash[] = {5.0, 5.0};
CGContextSetLineDash(context, 0.0, dash, 2);
[path stroke];

13. CADisplayLink

• CADisplyLink 在使用的时候，我们需要把它添加到一个runloop中，并给它绑定一个target和selector，才能在屏幕以1/60秒刷新的时候调用绑定方法。

self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkAction:)];
[self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

14. 贝塞尔曲线

• 基本绘制

- (void)moveToPoint:(CGPoint)point;

- (void)addLineToPoint:(CGPoint)point;

// 由两个点来控制曲线的绘制
- (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2;

// 由一个点来控制曲线的绘制
- (void)addQuadCurveToPoint:(CGPoint)endPoint controlPoint:(CGPoint)controlPoint;

• 绘制一个填充区域

[self.buttonColor setFill];
UIRectFill(rect);

与

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddRect(context, rect);
[self.buttonColor set];
CGContextFillPath(context);

一样的效果

15. 弹簧动画

[UIView animateWithDuration:0.7 delay:i*(0.3/self.subviews.count) usingSpringWithDamping:0.6f initialSpringVelocity:0.0f options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionAllowUserInteraction animations:^{
    menuButton.transform = CGAffineTransformIdentity;
} completion:NULL];

16. 新版本的判断

- (BOOL)isNewVersion {
    NSDictionary *dict = [NSBundle mainBundle].infoDictionary;
    NSString *nowVersion = dict[@"CFBundleShortVersionString"];
    NSString *beforeVersion = [[NSUserDefaults standardUserDefaults] doubleForKey:@"sanboxVersionKey"];
    if ([nowVersion isEqual: beforeVersion]) {
        [[NSUserDefaults standardUserDefaults] setObject:nowVersion forKey:@"sanboxVersionKey"];
    }
    return [nowVersion isEqual: beforeVersion];
}

17. 沙盒、Document、temp、Libiary/preference、Libiary/cache目录

// 沙盒根目录
 NSString *home = NSHomeDirectory(); 

// Document文件夹
NSString *ss = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;

// tmp文件夹
NSString *tmp = NSTemporaryDirectory();

// Libiary 的preference文件夹 偏好设置
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 

// Libiary/cache 文件夹
NSString *ss1 = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;

18. 隐藏文件的显示与隐藏

• 显示

defaults write com.apple.finder AppleShowAllFiles -boolean true ; killall Finder

• 隐藏

defaults write com.apple.finder AppleShowAllFiles FALSE ; killall Finder

19. 打电话

NSString *number = bottomView.member.phone;
NSString *phone = [@"tel://" stringByAppendingString:number];
    
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectZero];
NSURL *url = [NSURL URLWithString:phone];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
[self addSubview:webView];