苹果开发工具下载地址
https://developer.apple.com/download/more/
获取一张随机图片picsum.photos
切换终端对应的xcode，Xcode.app根据自己的名字修改
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
监听UITextField值的变化
[self.textField addTarget:self action:@selector(textChange:) forControlEvents:UIControlEventEditingChanged];
设置按钮图片距右
button.semanticContentAttribute = UISemanticContentAttributeForceRightToLeft;
静态字符串隐藏实现（仿系统）
// .h实现
typedef NSString * kCustomKey NS_EXTENSIBLE_STRING_ENUM;
UIKIT_EXTERN kCustomKey const _Nullable CustomKeyType ;
//.m实现
NSString * const CustomKeyType = @"custom_key_type";
Block
//局部block
NSAttributedString *(^createAttrStr)(NSString *, NSString *) = ^NSAttributedString *(NSString *a, NSString *b) {}
createAttrStr(@"数量",@"123");
@property(nonatomic,copy) void(^block)(NSString *string);//作为属性
- (void)failure:(nullable void (^)(NSError *error))failure;//作为方法参数
模拟器键盘切换隐藏和显示
command+k
屏幕旋转
self.view.transform = CGAffineTransformMakeRotation(M_PI/2);
CGRect frame = [UIScreen mainScreen].bounds;
self.view.bounds = CGRectMake(0, 0, frame.size.height, frame.size.width);
更改图片的颜色
1.代码更改
UIImage *image = [[UIImage imageNamed:@"***"]imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
//button imageview 设置颜色后，设置tintColor
[view setTintColor:[UIColor redColor]];
2.代码更改
Assets.xcasset——>选择图片——>右上角（Render As）选择 Template Image
xib或者代码设置tintColor即可
更改图片的颜色
使用XIB设置
UITextField的Clear Button:属性为Appears while editing
如果用代码写，则设置：
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
删除SceneDelegate
1.删除SceneDelegate的.h.m文件。
2.删除info.plist中的“Application Scene Manifest”项。
3.删除AppDelegate.m里面关于SceneDelegate的代码。
4.在AppDelegate.h中添加
@property (nonatomic, strong)UIWindow *window;
判断iPhone的刘海屏幕
#define Is_X \
({BOOL isPhoneX = NO;\
if (@available(iOS 11.0, *)) {\
isPhoneX = [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom > 0.0;\
}\
(isPhoneX);})
// 导航栏高度
#define TopHeight (Is_X ? 88 : 64)
// TabBar栏高度
#define BottomHeight (Is_X ? (49 + 34) : 49)
//状态栏高度
#define NaviTopY (Is_X ? 44 : 20)
//TabBar底部安全区域
#define TabBottomY (Is_X ? 34 : 0)
取bundle图片
[UIImage imageNamed:@"***.bundle/imageName"];
UITableView自动高度
//代理返回
UITableViewAutomaticDimension
调用字符串方法
SEL sel = NSSelectorFromString(methodName);
if (sel) {
IMP imp = [self methodForSelector:sel];
if (imp) {
void *(*func)(id,SEL) = (void *)imp;
func(self,sel);
}
}
view跟随手指移动
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
[moveView addGestureRecognizer:pan];
- (void)panAction:(UIPanGestureRecognizer *)sender{
CGPoint point = [sender locationInView:xView];//相对于xView的👈
if(sender.state == UIGestureRecognizerStateChanged){
CGFloat x = point.x;
//根据需要更改坐标
}
}
取消子view响应父view的手势
//方法1
CGPoint point = [gestureRecognizer locationInView:self.bgView];
BOOL result = [self.bgView.layer containsPoint:point];
//方法2 delegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if ([touch.view isDescendantOfView:self.bgView]) {
return NO;
}
return YES;
}
