ios开发零散知识点总结

1：当有导航栏的时候，子视图为UIScrollView，或是继承于UIScrollView的控件如UITableView，UICollectionView等，控制器会自动调用

self.automaticallyAdjustsScrollViewInsets = YES；方法，自动为控件添加64的额外的滚动区域，若存在多个控件，则系统会自动找到第一个添加的控件，执行此方法，增加64额外的滚动区域，如果想禁止此操作，可在控制器中实现方法：self.automaticallyAdjustsScrollViewInsets = NO；或是设置UIScrollView的contentInset，tableView的contentInset，来减少滚动区域。

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 1：不会自动去调整uiscrollView的contentInset属性
    self.automaticallyAdjustsScrollViewInsets = NO;
    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.frame = CGRectMake(0, 200, 200, 200);
    scrollView.backgroundColor = [UIColor redColor];
    [self.view addSubview:scrollView];
    
    [scrollView addSubview:[[UISwitch alloc] init]];
}

2：在宏定义文件中的NSLog定义

#ifdef DEBUG

#define DLog(...)  NSLog(__VA_ARGS__)

#else

#define DLog(...)

#endif

一些颜色的宏定义

//1:RGB颜色
#define RGB(a,b,c) [UIColor colorWithRed:(a)/255.0 green:(b)/255.0 blue:(c)/255.0 alpha:1]

//2:包含设置透明度
#define RGBColor(a,b,c,d) [UIColor colorWithRed:(a)/255.0 green:(b)/255.0 blue:(c)/255.0 alpha:d]

//3：随机色
#define ARC4Color RGB(arc4random_uniform(256),arc4random_uniform(256),arc4random_uniform(256))

3：pch文件的定义：在项目的Target---BuildSetting---prefixHeader---删除在桌面文件夹的路径，只保留项目的路径，再输入$(SRCROOT),如：$(SRCROOT)/网易新闻抽屉效果/Classes/Main/Utils/PrefixHeader.pch

4：通过图形上下文将color绘制成一张图片：

1 //提供颜色接口，返回一张图片
2 
3 #import <UIKit/UIKit.h>
4 
5 @interface UIImage (Cqb)
6 
7 +(UIImage*)imageWithColor:(UIColor*)color;
8 @end

 1 #import "UIImage+Cqb.h"
 2 
 3 @implementation UIImage (Cqb)
 4 
 5 + (UIImage*)imageWithColor:(UIColor*)color {
 6     
 7     //1:开启基于位图的图形上下文
 8     CGFloat imageWidth = 100;
 9     CGFloat imageHeight = 100;
10     UIGraphicsBeginImageContextWithOptions(CGSizeMake(imageWidth, imageHeight), NO, 0.0);
11     
12     //2:画一个color颜色的矩形框
13     [color set];
14     UIRectFill(CGRectMake(0, 0, imageWidth, imageHeight));
15     
16     //3:得到图片
17     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
18     
19     //4:关闭图形上下文
20     UIGraphicsEndImageContext();
21     
22     return image;
23 }

5：UIView计算尺寸的分类：

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface UIView (Cqb)
 4 @property (nonatomic,assign)CGFloat X;
 5 @property (nonatomic,assign)CGFloat Y;
 6 @property (nonatomic,assign)CGFloat width;
 7 @property (nonatomic,assign)CGFloat height;
 8 @property (nonatomic,assign)CGFloat centerX;
 9 @property (nonatomic,assign)CGFloat centerY;
10 @property (nonatomic,assign)CGSize  size;
11 @end

 1 #import "UIView+Cqb.h"
 2 
 3 @implementation UIView (Cqb)
 4 
 5 - (void)setX:(CGFloat)X {
 6     
 7     CGRect frame = self.frame;
 8     frame.origin.x = X;
 9     self.frame = frame;
10     
11 }
12 
13 - (CGFloat)X {
14     
15     return self.frame.origin.x;
16 }
17 
18 - (void)setY:(CGFloat)Y {
19     
20     CGRect frame = self.frame;
21     frame.origin.y = Y;
22     self.frame = frame;
23     
24 }
25 
26 - (CGFloat)Y {
27     
28     return self.frame.origin.y;
29 }
30 
31 - (void)setWidth:(CGFloat)width {
32     
33     CGRect frame = self.frame;
34     frame.size.width = width;
35     self.frame = frame;
36 
37 }
38 
39 - (CGFloat)width {
40     
41     return self.frame.size.width;
42 }
43 
44 - (void)setHeight:(CGFloat)height {
45     
46     CGRect frame = self.frame;
47     frame.size.height = height;
48     self.frame = frame;
49 }
50 
51 - (CGFloat)height {
52     
53     return self.frame.size.height;
54 }
55 
56 - (void)setCenterX:(CGFloat)centerX {
57     
58     CGPoint center = self.center;
59     center.x = centerX;
60     self.center = center;
61 
62 }
63 
64 - (CGFloat)centerX {
65     
66     return self.center.x;
67 }
68 
69 - (void)setCenterY:(CGFloat)centerY {
70     
71     CGPoint center = self.center;
72     center.y = centerY;
73     self.center = center;
74 }
75 
76 - (CGFloat)centerY {
77     
78     return self.center.y;
79 }
80 
81 - (void)setSize:(CGSize)size {
82     
83     CGRect frame = self.frame;
84     frame.size = size;
85     self.frame = frame;
86 
87 }
88 
89 - (CGSize)size {
90     
91     return self.frame.size;
92 }
93 
94 
95 @end

6：对自定义UIBarButtonItem的分类封装：

1 #import <UIKit/UIKit.h>
2 
3 @interface UIBarButtonItem (Extension)
4 + (UIBarButtonItem *)itemWithImageName:(NSString *)imageName target:(id)target action:(SEL)action;
5 @end

 1 #import "UIBarButtonItem+Extension.h"
 2 
 3 @implementation UIBarButtonItem (Extension)
 4 + (UIBarButtonItem *)itemWithImageName:(NSString *)imageName target:(id)target action:(SEL)action
 5 {
 6     UIButton *button = [[UIButton alloc] init];
 7     [button setBackgroundImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
 8     
 9     // 设置按钮的尺寸为背景图片的尺寸
10     button.size = button.currentBackgroundImage.size;
11     
12     // 监听按钮点击
13     [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
14     return [[UIBarButtonItem alloc] initWithCustomView:button];
15 }
16 @end

6：当做真机调试的时候，要在buildSetting中配置好证书，并在info里选择开发者账号才可以